[ CAS No. 120687-07-2 ] {[proInfo.proName]}

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Quality Control of [ 120687-07-2 ]

COA NMR CNMR HPLC LC-MS

Related Doc. of [ 120687-07-2 ]

SDS Specification

Alternatived Products of [ 120687-07-2 ]

Product Details of [ 120687-07-2 ]

CAS No. :	120687-07-2	MDL No. :	MFCD08063728
Formula :	C₁₂H₁₇N₅O₃	Boiling Point :	-
Linear Structure Formula :	-	InChI Key :	OUMGIMAEASXOJH-UHFFFAOYSA-N
M.W :	279.30	Pubchem ID :	10039252
Synonyms :

Calculated chemistry of [ 120687-07-2 ]

Physicochemical Properties

Num. heavy atoms :	20
Num. arom. heavy atoms :	9
Fraction Csp3 :	0.5
Num. rotatable bonds :	7
Num. H-bond acceptors :	6.0
Num. H-bond donors :	2.0
Molar Refractivity :	72.28
TPSA :	116.15 Å²

Pharmacokinetics

GI absorption :	High
BBB permeant :	No
P-gp substrate :	Yes
CYP1A2 inhibitor :	No
CYP2C19 inhibitor :	No
CYP2C9 inhibitor :	No
CYP2D6 inhibitor :	No
CYP3A4 inhibitor :	No
Log Kp (skin permeation) :	-8.45 cm/s

Lipophilicity

Log Po/w (iLOGP) :	1.78
Log Po/w (XLOGP3) :	-0.63
Log Po/w (WLOGP) :	-0.02
Log Po/w (MLOGP) :	-0.64
Log Po/w (SILICOS-IT) :	0.05
Consensus Log Po/w :	0.11

Druglikeness

Lipinski :	0.0
Ghose :	None
Veber :	0.0
Egan :	0.0
Muegge :	0.0
Bioavailability Score :	0.55

Water Solubility

Log S (ESOL) :	-1.05
Solubility :	25.1 mg/ml ; 0.09 mol/l
Class :	Very soluble
Log S (Ali) :	-1.34
Solubility :	12.9 mg/ml ; 0.0461 mol/l
Class :	Very soluble
Log S (SILICOS-IT) :	-2.15
Solubility :	1.98 mg/ml ; 0.0071 mol/l
Class :	Soluble

Medicinal Chemistry

PAINS :	0.0 alert
Brenk :	0.0 alert
Leadlikeness :	0.0
Synthetic accessibility :	2.7

Safety of [ 120687-07-2 ]

Signal Word:	Warning	Class:
Precautionary Statements:	P501-P270-P264-P280-P302+P352-P337+P313-P305+P351+P338-P362+P364-P332+P313-P301+P312+P330	UN#:
Hazard Statements:	H302-H315-H319	Packing Group:
GHS Pictogram:

Application In Synthesis of [ 120687-07-2 ]

* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.

Upstream synthesis route of [ 120687-07-2 ]
Downstream synthetic route of [ 120687-07-2 ]

[ 120687-07-2 ] Synthesis Path-Upstream 1~2

1
[ 97845-60-8 ]
[ 104227-87-4 ]
[ 120687-07-2 ]

Yield	Reaction Conditions	Operation in experiment
89.7%	With water; ammonium formate In ethyl acetate at 50℃; for 5 h;	Into a jacketed reactor equipped with a mechanical stirrer, a reflux condenser and a thermocouple, under an inert atmosphere (N2), was added wet 10 percent Pd/C (12 g, 50 percent H20), EtOAc (660 ml), CL-FMC (60 g; 168.6 mmol), and ammonium formate (32.8 g; 504.5 mmol; 97 percent pure). The reaction mixture was heated at 50°C. After 5 hours, all the CL-FMC was consumed, and the composition of the reaction mixture showed 99.6 percent FMC, 0. 1 percent, of MH-FMC and traces of the DH-FMC. The reaction mixture was filtered at 50°C and the filtrate was evaporated to dryness, leaving 51.5 g of solid (95 percent of the 54.2 g expected). The solid was crystallized from n-BuOH (61°C ; 155 ml). After cooling in ice-water bath, filtration and drying (6 hrs ; 60°C) 48.6 g of pure FMC (89.7 percent yield) was obtained (99.8 percent FMC; MH-FMC level was less than 0.1 percent HPLC area percent).
62%	With water; ammonium formate In ethyl acetate at 50 - 70℃; for 4 - 5 h;	Into a jacketed reactor equipped with a mechanical stirrer and a reflux condenser, under an inert atmosphere (N2), was added wet 10 percent Pd/C (18.9 g, 52 percent H20), EtOAc (423 ml) AND CL-FMC (90 g; 252.9 mmol). The reaction mixture was heated to 70°C. Ammonium formate (19.7 g; 312.4 mmol) was added in 11 portions. The portions were added every 20 min. After 4 hours, all the Cl-FMC was consumed. The reaction mixture was diluted to 720 ml and filtered at 40°C. A charcoal (4.5 g) was added to the filtrate and the mixture was stirred for 30 min. Then the charcoal was filtered out and washed (90 ml) EtOAc. The wash was added to the filtrate. The filtrate was distillated back to 423 ml of EtOAc. Precipitation occurred during the distillation. The mixture was heated until a clear solution was obtained. Then the solution was cooled (4 hrs; 10°C) and precipitation occurred during the cooling process. After 12 hrs of stirring, the material was filtered out and was washed with water, and a wet famciclovir was obtained. The material was dried 3 hr at 45°C and 3 hr at 65°C. FMC (62 percent yield) was obtained (MH- FMC level was 0.03 percent HPLC).Example 13 Preparation of Acetic ACID 2-ACETOXYMETHYL-4-(2-AMINO-PURIN-9-YL)-BUTYL ester (FMC) from Acetic acid 2-acetoxymethyl-4- (5-amino-7-chloro-imidazo [4,5- B] PYRIDIN-3-YL)-BUTYL ester (Cl-FMC) Into a jacketed reactor equipped with a mechanical stirrer and a reflux condenser, under an inert atmosphere (N2), was added wet 10 percent PD/C (68. 7 g, 52 percent H20), EtOAc (1550 ml) and Cl-FMC (330 g ; 927. 5 MMOL). The reaction mixture was heated to 50°C. Ammonium formate (71.2 g; 1130.3 mmol) was added in 11 portions. The portions were added every 20 min. After 5 hours, all the Cl-FMC was consumed. The reaction mixture was diluted to 2640 ml and filtered at 50°C. A charcoal (16.5 g) was added to the filtrate and the mixture was stirred for 30 min. Then the charcoal was filtered out and washed (330 ML) OF ETOAC. The wash was added to the filtrate. The filtrate was DISTILLATED back TO 1, 550 ML OF EOTAC. The mixture was heated until a clear solution obtained. Then the solution was cooled (5.5 hrs ;-10°C) and precipitation occurred during the cooling process. After 12 hr of stirring, the material was filtered out and was washed with water, and a wet famciclovir was obtained. The material was dried 3 hr at 45°C and 3 hr at 65°C. FMC (69.8 percent yield) was obtained (MH-FMC level was 0.06 percent HPLC).
0.27 - 0.29 %Chromat.	Stage #1: at 20 - 42℃; Stage #2: With ammonium formate In water for 3.5 - 7 h;	A MIXTURE OF 6. 2 G wet "10 percent Pd/C"(wt Pd/wt Pd+C) 52.14 percent H2O (wt H2O/wt of Pd+C+H2O), H2O (120 ml) and Cl-FMC (30 g; 83.1 mmol) was added, under an inert atmosphere of nitrogen, into a JACKETED REACTOR EQUIPMENT with a mechanical stirrer, a reflux condenser and a THERMOCOUPLE. THE MIXTURE WAS HEATED TO 42°C. A solution of ammonium FBNNATE (6. 5 g; 99.7 MMOL; 20 percent excess) in 20 ml H20 was added dropwise for 2. 5 HOURS. AFTER 30 min., charcoal (3 G) was added and the solution was continued to be stirred for an additional time of 30 min. The reaction mixture was filtered, and the catalyst was washed with 10 ml H2O. The filtrate was stirred for 2 hours in an ice bath (2°C). The precipitated solid was filtered and washed WITH 15 ML cold 20, LEAVING 31. 5 g wet solid precipitate. Upon drying, 22. 4 G of a very white solid was obtained (83. 6percent of the expected). The MH-FMC LEVEL WAS 0. 29percent and the FMC yield was 83.3 percent (HPLC area percent). Example 2 Preparation of Acetic acid 2-acetoxymethyl-4-(2-amino-purin-9-yl)-butyl ester (FMC) from 9-[4-acetoxy-3(acetoxymethyl)but-1-yl]-2-amino-6-chloropurine-(Cl- FMC) A MIXTURE OF 6. 2 G WET"10percent PD/C" (BASED on the weight of Pd+C) with 52. 14 percent H2O (wt H2O/wt of Pd+C+H2O), H2O (120 ml) and Cl-FMC (30 g; 83.1 MMOL) WAS ADDED,-UNDER AN INERT ATMOSPHERE OF NITROGEN, INTO a JACKETED REACTOR equipment with a MECHANICAL STIRRER, a reflux condenser and a thermocouple. The mixture was preheated to 35°C. A solution of ammonium formte (5.4 g; 83.1 mmole; 8.4percent in excess) in 20 ml H2O was added dropwise for 2.5 hours. After 30 MIN., CHARCOAL (3 G) WAS ADDED AND the solution was stirred for 30 min. The reaction mixture was filtered, and the catalyst obtained was washed with 10 ml H2O. The filtrate was stirred for 2 hours in an ice bath (2°C). The precipitated solid was filtered and washed with 15 ml cold H2O, leaving 31.5 g wet solid precipitate. Upon drying, 22. 4 g of a very white solid was obtained (81.3percent OF THE EXPECTED). THE MH-FMC level was 0.27percent and the CL-FMC was 0. 08percent (HPLC area percent). All other impurities levels were less than 0. 06percent (HPLC AREA percent). Example 3 PREPARATION OF ACETIC ACID 2-ACETOXYMETHYL-4- (2-AMINO-PUNN-9-YL)-BUTYL ESTER (FOC) FROM 9- [4-ACETOXY-3- (ACETOXYMETHYL) BUT-L-YL]-2-AMINO-6-CHLOROPUNNE (CL- FMC) Into A JACKETED REACTOR EQUIPMENT with a mechanical STIRRER, a reflux condenser and a thermocouple, under an inert atmosphere (N2), a mixture of wet"10 percent P LIJC (D 2 g, wherein the 10percent is based on THE COMBINED WEIGHT OFPD AND C, HAVING 52. 14 percent I20 (WT OF NZO/WT OF P+C+H2C3)),,-HSO (120 ML) and C1-FMC (30 G ; 83. 1 MMO .) was added. The mixture was maintained at room temperature. A solution of ammonium formate (5.4 g; 83. 1 mmole ; 8.4percent in excess) in 20 ML H20 was added DROPWISE FOR 6 HOURS. AFTER 30 MIN. , CHARCOAL (3 G) WAS ADDED AND THE SOLUTION WAS stirred for 30 min. The reaction mixture was filtered, and the catalyst was washed with 10 ml H20. The filtrate was stirred for 2 hours in an ice bath (2°C). The precipitated solid was filtered and washed with 15 ml cold H20, leaving 31.5 g wet solid precipitate. Upon drying, 22.4 g of a very white solid was obtained (81.3percent of the expected). The MH-FMC level was 0.27percent and the CL-FMC was 0. 08percent (HPLC area percent). All other impurities were less than 0. 06percent (HPLC area percent).

Reference： [1] Patent: WO2004/99208, 2004, A1, . Location in patent: Page 10
[2] Patent: WO2004/99208, 2004, A1, . Location in patent: Page 11-12
[3] Patent: WO2005/26167, 2005, A1, . Location in patent: Page/Page column 6-8

2
[ 97845-60-8 ]
[ 104227-87-4 ]
[ 104227-86-3 ]
[ 120687-07-2 ]

Yield	Reaction Conditions	Operation in experiment
64%	With ammonium formate In methanol; acetic acid methyl ester at 40℃; for 6.16667 h;	Into a jacketed reactor equipped with a mechanical stirrer, a reflux condenser and a thermocouple, under an inert atmosphere (N2), was added dry 7 percent Pd/C (3.48 g), MeOAc (500 ml), MEOH (50 ml), Cl-FMC (50.1 g; 49.6 mmol), and ammonium formate (27. 18 g; 97 percent pure). The reaction mixture was heated at 40°C for 6 hours and 10 min. At this stage 98. 37 percent FMC, 0.82 percent MH-FMC and 0.63 percent DH-FMC and 0.18 percent Cl- FMC; were detected. Upon cooling the reaction mixture and filtering the black solid, the filtrate was evaporated to dryness leaving 43.77 g solid (almost the entire expected amount of FMC; assay 97.3 percent FMC). The composition of the solid was left unchanged from the above quotation. The solid was partitioned in EtOAc (365 ml) and water (150 ml). The organic phase was washed with H20 (45 ml), and kept aside. The combined aqueous phases were washed with EtOAc (3 x 40 ml). The combined EtOAc extracts were washed with H20 (40 ml), and kept aside. The aqueous phases were extracted again with EtOAc (2 x 40 ml). The EtOAc extracts were washed with HA0 (10 ml), and kept aside. The three organic phases were combined, dried with MGS04 and evaporated to dryness leaving 34.7 g white solid (-76. 8 percent yield). The solid was crystallized in BUOH (100 ml; 63°C) giving 28.9 g pure FMC (64 percent yield). Less then 0.1 percent impurities (each) were detected in the crystals.

Reference： [1] Patent: WO2004/99208, 2004, A1, . Location in patent: Page 6-7
[2] Patent: WO2004/99208, 2004, A1, . Location in patent: Page 6-7
[3] Patent: WO2004/99208, 2004, A1, . Location in patent: Page 8
[4] Patent: WO2004/99208, 2004, A1, . Location in patent: Page 7-8
[5] Patent: WO2004/99208, 2004, A1, . Location in patent: Page 8-9
[6] Patent: WO2004/99208, 2004, A1, . Location in patent: Page 9

[ 120687-07-2 ] Synthesis Path-Downstream 1~7

1
[ 104227-87-4 ]
[ 120687-07-2 ]

Reference： [1]Journal of Medicinal Chemistry,1989,vol. 32,p. 1738 - 1743
[2]ChemCatChem,2014,vol. 6,p. 1028 - 1042

2
[ 17175-16-5 ]
[ 120687-07-2 ]
acetic acid 4-(2-amino-purin-9-yl)-2-methoxycarbonyloxymethyl-butyl ester [ No CAS ]

Yield	Reaction Conditions	Operation in experiment
86%	With dmap In pyridine at 80℃; for 20h;

Reference： [1]Kim, Dae-Kee; Lee, Namkyu; Ryu, Do Hyun; Kim, Young-Woo; Kim, Jae-Sun; Chang, Kieyoung; Im, Guang-Jin; Choi, Won-Son; Cho, Yong-Baik; Kim, Key H.; Colledge, Danni; Locarnini, Stephen [Bioorganic and Medicinal Chemistry, 1999, vol. 7, # 8, p. 1715 - 1725]

3
[ 97845-60-8 ]
[ 120687-07-2 ]

Reference： [1]Journal of Medicinal Chemistry,1989,vol. 32,p. 1738 - 1743

4
[ 97845-60-8 ]
[ 104227-87-4 ]
[ 104227-86-3 ]
[ 120687-07-2 ]

Yield	Reaction Conditions	Operation in experiment
64%	With ammonium formate;palladium on charcoal; In methanol; acetic acid methyl ester; at 40℃; for 6.16667h;Product distribution / selectivity;	Into a jacketed reactor equipped with a mechanical stirrer, a reflux condenser and a thermocouple, under an inert atmosphere (N2), was added dry 7 % Pd/C (3.48 g), MeOAc (500 ml), MEOH (50 ml), Cl-FMC (50.1 g; 49.6 mmol), and ammonium formate (27. 18 g; 97 % pure). The reaction mixture was heated at 40C for 6 hours and 10 min. At this stage 98. 37 % FMC, 0.82 % MH-FMC and 0.63 % DH-FMC and 0.18 % Cl- FMC; were detected. Upon cooling the reaction mixture and filtering the black solid, the filtrate was evaporated to dryness leaving 43.77 g solid (almost the entire expected amount of FMC; assay 97.3 % FMC). The composition of the solid was left unchanged from the above quotation. The solid was partitioned in EtOAc (365 ml) and water (150 ml). The organic phase was washed with H20 (45 ml), and kept aside. The combined aqueous phases were washed with EtOAc (3 x 40 ml). The combined EtOAc extracts were washed with H20 (40 ml), and kept aside. The aqueous phases were extracted again with EtOAc (2 x 40 ml). The EtOAc extracts were washed with HA0 (10 ml), and kept aside. The three organic phases were combined, dried with MGS04 and evaporated to dryness leaving 34.7 g white solid (-76. 8 % yield). The solid was crystallized in BUOH (100 ml; 63C) giving 28.9 g pure FMC (64 % yield). Less then 0.1 % impurities (each) were detected in the crystals.
	With ammonium formate;palladium on charcoal; In methanol; acetic acid methyl ester; at 40℃; for 1.6 - 6h;Product distribution / selectivity;	Into a jacketed reactor equipped with a mechanical stirrer, a reflux condenser and a thermocouple, under an inert atmosphere (N2), was added dry 11.4 % PD/C (2.3 G), MeOAc (200 ml), MEOH (20 ml), CL-FMC (20 g; 55. 8 mmol), and ammonium formate (10.5 g; 97 % pure). The reaction mixture was heated at 40C. Complete conversion of CL-FMC was observed within 1 hr and 40 min. Under these conditions two hydrolysis by-products, mono-hydroxy FMC (MH-FMC) and di-hydroxy FMC (DH-FMC) were formed, 0.9 % and 0.64 %, respectively. The reaction mixture was left to stir for a total of 4 hours at 40C. This did not have a significant effect on the level of the by-products THAT REMAINED STEADY, I. E. , THE MH-FMC AND DH-FMC LEVEL WAS 1. 05 % AND 0. 72 %, respectively. The reaction was cooled to room temperature, then filtered. This solid retained 0.9 % MH-FMC and only 0.6 % of the DH-FMC.; Example 3 Preparation of Acetic acid 2-acetoxymethyl-4- (2-amino-purin-9-yl)-butyl ester (FMC) from Acetic acid 2-acetoxymethyl-4- (5-amino-7-chloro-imidazo [4,5- B] PYRIDIN-3-YL) -BUTYL ESTER (CL-FMC) Into a jacketed reactor equipped with a mechanical stirrer, a reflux condenser and a thermocouple, under an inert atmosphere (N2), was added dry 5.38 % Pd/C (1.07 g), MeOAc (200 ml), MEOH (20 ml), Cl-FMC (20.04 g; 55.85 mmol), and ammonium formate (10.48 g; 97 % pure). The reaction mixture was heated at 40C for 6 hours. The reaction mixture composition was 96.7 % FMC, 0.86 % DH-FMC, 1.07 % of MH-FMC and 1.27 % Cl-FMC. The reaction mixture was cooled to room temperature, filtered and the filtrate was evaporated to dryness leaving 17.94 g of white solid (assay 94.8 % FMC).
	With water; ammonium formate;palladium on charcoal; In methanol; acetic acid methyl ester; at 40℃; for 4h;Product distribution / selectivity;	Into a jacketed reactor equipped with a mechanical stirrer, a reflux condenser and a thermocouple, under an inert atmosphere (N2), was added wet 5.7 % Pd/C (2.27 g; 50% H20), MeOAc (110 ml), MEOH (110 ml), CL-FMC (20 g; 55.74 mmol), and ammonium formate (10.54 g; 97% pure). The reaction mixture was heated at 40C for 4 hours. The reaction mixture composition was 96.3 % FMC, 1.06 % DH-FMC, 2.64 % OF MH-FMC. No Cl-FMC was detected. The reaction mixture was cooled, filtered. The filtrate was concentrated to 53.5 g slurry. The white solid was filtered and washed with hexane, leaving 19.24 g solid (assay 87.5% FMC; expected amount 17.91g).

	With water; ammonium formate;palladium on charcoal; In acetic acid methyl ester; at 40℃; for 4.5h;Product distribution / selectivity;	Into a jacketed reactor equipped with a mechanical stirrer, a reflux condenser and a thermocouple, under an inert atmosphere (N2), was added 5.46 % Pd/C wet (2.27 g; 50 % H20), MeOAc (220 ml), CL-FMC (21 g; 58. 5 mmol), and ammonium formate (10.66 g; 97 % pure). The reaction mixture was heated at 40C for 4.5 hours. The reaction mixture composition was 74.47 % FMC, 0.64 % DH-FMC, 0.74 % of MH-FMC and 35 % Cl- FMC. MEOH was added (20 ml) and the reaction mixture was left for 1 more hour at 40C, then cooled to room temperature and stirred overnight. The reaction proceeded further and the composition of the reaction mixture was 89. 6 % FMC, 0.73 % DH-FMC, 0.9 % of MH-FMC and 8.8 % Cl-FMC. Heating was continued 135 min. more at 40C and the composition of the reaction mixture was 93.05 % FMC, 0.81 % DH-FMC, 1 % of MH-FMC and 5 % Cl-FMC. The reaction mixture was filtered and the filtrate was concentrated to 40.3 g of slurry. The solid was filtered and washed to give 13.64 g solid composed of 97.53 % FMC, 0.34 % DH-FMC, 0.69 % OF MH-FMC and 1.44 % CL-FMC (assay 96.5% FMC).
	With water; ammonium formate;palladium on charcoal; In methanol; at 40℃; for 4.5h;Product distribution / selectivity;	Into a jacketed reactor equipped with a mechanical stirrer, a reflux condenser and a thermocouple, under an inert atmosphere (N2), was added wet 5.56 % Pd/C (4.4 g; 50% H20), MEOH (440 ml), Cl-FMC (40 g; 111.5 mmol), and ammonium formate (21.96 g; 97 % pure). The reaction mixture was heated at 40C for 4.5 % hours. The reaction mixture composition was 95.8 % FMC, 0.55 % DH-FMC, 3.3 % of MH-FMC. No Cl- FMC was detected. The reaction mixture was cooled and filtered.
	With ammonium formate;palladium on charcoal; In methanol; ethyl acetate; at 40℃; for 5.16667h;Product distribution / selectivity;	Into a jacketed reactor equipped with a mechanical stirrer, a reflux condenser and a thermocouple, under an inert atmosphere (N2), was added dry 5.4 % PD/C (1.07 g), EtOAc (220 ml), MEOH (20 ml); Cl-FMC (20 g; 55.8 mmol), and ammonium formate (10.5 g; 97 % pure). The reaction mixture was heated at 40C for 5 hours 10 min. The reaction mixture composition was 50.57 % FMC, 0.54 % DH-FMC, 0.53 % OF MH-FMC and 48.36 % Cl-FMC. MEOH was added (20 ml) and the reaction mixture continued at 40C for 80 min. more. Leaving the composition unchanged. The reaction mixture was left to stir overnight at room temperature. While the CL-FMC was consumed slightly more (44.1 %) the MH-FMC and DH-FMC level remained steady. After heating to 40C 3 hours more showed a progress of the reaction to 76.7 % FMC, 0.67 % DH-FMC, 0.93 % MH-FMC and 21.53 % Cl-FMC. More MEOH was added (40 ml) and the reaction was continued 2.5 hours. The composition of the reaction mixture was 96.14 % FMC, 0.79 % DH-FMC, 1.3 % of MH-FMC and 1.55 % Cl-FMC. After cooling to room temperature, the reaction mixture was filtered and the filtrate was evaporated to dryness leaving 17.45 g solid composed of 97. 48 % FMC, 0.64 % DH-FMC, 1.14 % OF MH-FMC and 0.72 % CL-FMC (assay 97.1 % FMC).

Reference： [1]Patent: WO2004/99208,2004,A1 .Location in patent: Page 6-7
[2]Patent: WO2004/99208,2004,A1 .Location in patent: Page 6-7
[3]Patent: WO2004/99208,2004,A1 .Location in patent: Page 8
[4]Patent: WO2004/99208,2004,A1 .Location in patent: Page 7-8
[5]Patent: WO2004/99208,2004,A1 .Location in patent: Page 8-9
[6]Patent: WO2004/99208,2004,A1 .Location in patent: Page 9

5
[ 97845-60-8 ]
[ 104227-86-3 ]
[ 120687-07-2 ]

Yield	Reaction Conditions	Operation in experiment
0.71%; 1.85%	With water; ammonium formate;palladium on charcoal; In methanol; i-BuOAc; at 50℃; for 5h;Product distribution / selectivity;	Into a jacketed reactor equipped with a mechanical stirrer, a reflux condenser and a thermocouple, under an inert atmosphere (N2), was added wet 10 % Pd/C (3.92 g; 50 % H20), i-BuOAc (155 ml), MEOH (65 ml); CL-FMC (20 g; 55.8 mmol), and ammonium formate (11 g; 97 % pure). The reaction mixture was heated at 40C. After 75 min. all the Cl-FMC was consumed. At this level, 0.71 % DH-FMC and 1. 85 % MH-FMC were formed.

Reference： [1]Patent: WO2004/99208,2004,A1 .Location in patent: Page 9-10

6
[ 97845-60-8 ]
[ 104227-87-4 ]
[ 120687-07-2 ]

Yield	Reaction Conditions	Operation in experiment
89.7%	With water; ammonium formate;palladium on charcoal; In ethyl acetate; at 50℃; for 5h;Product distribution / selectivity;	Into a jacketed reactor equipped with a mechanical stirrer, a reflux condenser and a thermocouple, under an inert atmosphere (N2), was added wet 10 % Pd/C (12 g, 50 % H20), EtOAc (660 ml), CL-FMC (60 g; 168.6 mmol), and ammonium formate (32.8 g; 504.5 mmol; 97 % pure). The reaction mixture was heated at 50C. After 5 hours, all the CL-FMC was consumed, and the composition of the reaction mixture showed 99.6 % FMC, 0. 1 %, of MH-FMC and traces of the DH-FMC. The reaction mixture was filtered at 50C and the filtrate was evaporated to dryness, leaving 51.5 g of solid (95 % of the 54.2 g expected). The solid was crystallized from n-BuOH (61C ; 155 ml). After cooling in ice-water bath, filtration and drying (6 hrs ; 60C) 48.6 g of pure FMC (89.7 % yield) was obtained (99.8 % FMC; MH-FMC level was less than 0.1 % HPLC area %).
62 - 69.8%	With water; ammonium formate;palladium on charcoal; In ethyl acetate; at 50 - 70℃; for 4 - 5h;Product distribution / selectivity;	Into a jacketed reactor equipped with a mechanical stirrer and a reflux condenser, under an inert atmosphere (N2), was added wet 10 % Pd/C (18.9 g, 52 % H20), EtOAc (423 ml) AND CL-FMC (90 g; 252.9 mmol). The reaction mixture was heated to 70C. Ammonium formate (19.7 g; 312.4 mmol) was added in 11 portions. The portions were added every 20 min. After 4 hours, all the Cl-FMC was consumed. The reaction mixture was diluted to 720 ml and filtered at 40C. A charcoal (4.5 g) was added to the filtrate and the mixture was stirred for 30 min. Then the charcoal was filtered out and washed (90 ml) EtOAc. The wash was added to the filtrate. The filtrate was distillated back to 423 ml of EtOAc. Precipitation occurred during the distillation. The mixture was heated until a clear solution was obtained. Then the solution was cooled (4 hrs; 10C) and precipitation occurred during the cooling process. After 12 hrs of stirring, the material was filtered out and was washed with water, and a wet famciclovir was obtained. The material was dried 3 hr at 45C and 3 hr at 65C. FMC (62 % yield) was obtained (MH- FMC level was 0.03 % HPLC).Example 13 Preparation of Acetic ACID » 2-ACETOXYMETHYL-4-(2-AMINO-PURIN-9-YL)-BUTYL ester (FMC) from Acetic acid 2-acetoxymethyl-4- (5-amino-7-chloro-imidazo [4,5- B] PYRIDIN-3-YL)-BUTYL ester (Cl-FMC) Into a jacketed reactor equipped with a mechanical stirrer and a reflux condenser, under an inert atmosphere (N2), was added wet 10 % PD/C (68. 7 g, 52 % H20), EtOAc (1550 ml) and Cl-FMC (330 g ; 927. 5 MMOL). The reaction mixture was heated to 50C. Ammonium formate (71.2 g; 1130.3 mmol) was added in 11 portions. The portions were added every 20 min. After 5 hours, all the Cl-FMC was consumed. The reaction mixture was diluted to 2640 ml and filtered at 50C. A charcoal (16.5 g) was added to the filtrate and the mixture was stirred for 30 min. Then the charcoal was filtered out and washed (330 ML) OF ETOAC. The wash was added to the filtrate. The filtrate was DISTILLATED back TO 1, 550 ML OF EOTAC. The mixture was heated until a clear solution obtained. Then the solution was cooled (5.5 hrs ;-10C) and precipitation occurred during the cooling process. After 12 hr of stirring, the material was filtered out and was washed with water, and a wet famciclovir was obtained. The material was dried 3 hr at 45C and 3 hr at 65C. FMC (69.8 % yield) was obtained (MH-FMC level was 0.06 % HPLC).
0.27 - 0.29%Chromat.		A MIXTURE OF 6. 2 G wet "10 % Pd/C"(wt Pd/wt Pd+C) 52.14 % H2O (wt H2O/wt of Pd+C+H2O), H2O (120 ml) and Cl-FMC (30 g; 83.1 mmol) was added, under an inert atmosphere of nitrogen, into a JACKETED REACTOR EQUIPMENT with a mechanical stirrer, a reflux condenser and a THERMOCOUPLE. THE MIXTURE WAS HEATED TO 42C. A solution of ammonium FBNNATE (6. 5 g; 99.7 MMOL; 20 % excess) in 20 ml H20 was added dropwise for 2. 5 HOURS. AFTER 30 min., charcoal (3 G) was added and the solution was continued to be stirred for an additional time of 30 min. The reaction mixture was filtered, and the catalyst was washed with 10 ml H2O. The filtrate was stirred for 2 hours in an ice bath (2C). The precipitated solid was filtered and washed WITH 15 ML cold 20, LEAVING 31. 5 g wet solid precipitate. Upon drying, 22. 4 G of a very white solid was obtained (83. 6% of the expected). The MH-FMC LEVEL WAS 0. 29% and the FMC yield was 83.3 % (HPLC area %). Example 2 Preparation of Acetic acid 2-acetoxymethyl-4-(2-amino-purin-9-yl)-butyl ester (FMC) from 9-[4-acetoxy-3(acetoxymethyl)but-1-yl]-2-amino-6-chloropurine-(Cl- FMC) A MIXTURE OF 6. 2 G WET"10% PD/C" (BASED on the weight of Pd+C) with 52. 14 % H2O (wt H2O/wt of Pd+C+H2O), H2O (120 ml) and Cl-FMC (30 g; 83.1 MMOL) WAS ADDED,-UNDER AN INERT ATMOSPHERE OF NITROGEN, INTO a JACKETED REACTOR equipment with a MECHANICAL STIRRER, a reflux condenser and a thermocouple. The mixture was preheated to 35C. A solution of ammonium formte (5.4 g; 83.1 mmole; 8.4% in excess) in 20 ml H2O was added dropwise for 2.5 hours. After 30 MIN., CHARCOAL (3 G) WAS ADDED AND the solution was stirred for 30 min. The reaction mixture was filtered, and the catalyst obtained was washed with 10 ml H2O. The filtrate was stirred for 2 hours in an ice bath (2C). The precipitated solid was filtered and washed with 15 ml cold H2O, leaving 31.5 g wet solid precipitate. Upon drying, 22. 4 g of a very white solid was obtained (81.3% OF THE EXPECTED). THE MH-FMC level was 0.27% and the CL-FMC was 0. 08% (HPLC area %). All other impurities levels were less than 0. 06% (HPLC AREA %). Example 3 PREPARATION OF ACETIC ACID 2-ACETOXYMETHYL-4- (2-AMINO-PUNN-9-YL)-BUTYL ESTER (FOC) FROM 9- [4-ACETOXY-3- (ACETOXYMETHYL) BUT-L-YL]-2-AMINO-6-CHLOROPUNNE (CL- FMC) Into A JACKETED REACTOR EQUIPMENT with a mechanical STIRRER, a reflux condenser and a thermocouple, under an inert atmosphere (N2), a mixture of wet"10 % P LIJC (D 2 g, wherein the 10% is based on THE COMBINED WEIGHT OFPD AND C, HAVING 52. 14 % I20 (WT OF NZO/WT OF P+C+H2C3)),,-HSO (120 ML) and C1-FMC (30 G ; 83. 1 MMO .) was added. The mixture was maintained at room temperature. A solution of ammonium formate (5.4 g; 83. 1 mmole ; 8.4% in excess) in 20 ML H20 was added DROPWISE FOR 6 HOURS. AFTER 30 MIN. , CHARCOAL (3 G) WAS ADDED AND THE SOLUTION WAS stirred for 30 min. The reaction mixture was filtered, and the catalyst was washed with 10 ml H20. The filtrate was stirred for 2 hours in an ice bath (2C). The precipitated solid was filtered and washed with 15 ml cold H20, leaving 31.5 g wet solid precipitate. Upon drying, 22.4 g of a very white solid was obtained (81.3% of the expected). The MH-FMC level was 0.27% and the CL-FMC was 0. 08% (HPLC area %). All other impurities were less than 0. 06% (HPLC area %).

Reference： [1]Patent: WO2004/99208,2004,A1 .Location in patent: Page 10
[2]Patent: WO2004/99208,2004,A1 .Location in patent: Page 11-12
[3]Patent: WO2005/26167,2005,A1 .Location in patent: Page/Page column 6-8

7
[ 104227-87-4 ]
9-(4-acetoxy-3-hydroxymethyl-1-yl)-2-aminopurine [ No CAS ]
[ 120687-07-2 ]

Yield	Reaction Conditions	Operation in experiment
30%	With potassium carbonate; In methanol; acetic acid;	Example 4 9-(4-Acetoxy-3-hydroxymethylbut-1-yl)-2-aminopurine To a solution of 9-(4-acetoxy-3-acetoxymethylbut-1-yl)-2-aminopurine (0.48g, 1.5mmol) in methanol (9ml) was added anhydrous potassium carbonate (14mg, 0.1mmol) and the solution was stirred for 20 minutes. Two drops of glacial acetic acid were added, the solution was filtered and the solvent was removed. The residue was purified by column chromatography on silica gel eluding with chloroform-methanol (15:1, 10:1) to afford 9-(4-acetoxy-3-hydroxymethyl-1-yl)-2-aminopurine as a white crystalline solid (124mg, 30%), m.p. 166-168; numax(KBr) 3440, 3220, 1720, 1650, 1615, and 1580cmmin1; deltaH[(CD3)2SO] 1.68 (1H, m, 3'-H), 1.82 (2H, m, 2'-H), 1.98 (3H, s, CH3), 3.41 (2H, t, J4.8Hz, D2O exchange gives d, CH 2OH), 3.9 - 4.05 (2H, AB part of ABX, JAB10.9Hz and JAX= JBX5.8Hz, CH2OCO), 4.12 (2H, t, J 7.2Hz, 1'-H), 4.62 (1H, t, J 5.0Hz, D2O exchangeable, OH), 6.44 (2H, s, D2O exchangeable, 2-NH2), 8.07 (1H, s, 8-H), and 8.56 (1H, s, 6-H); (Observed M+, 279.1326. C12H17N5O3 requires 279.1331).

Reference： [1]Patent: EP182024,1991,B1

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[ CAS No. 120687-07-2 ] {[proInfo.proName]}

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