* 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.
With potassium hydrogencarbonate In N,N-dimethyl-formamide at 0℃; for 5 h; Large scale
the reaction vessel in step (3) obtained in prulifloxacin crude acetonitrile and 358L stirred heated to reflux to dissolve transparent, coolish, adding 0. 05kg charcoal, keep stirring under reflux for 30 minutes, filtered hot and the filtrate was natural cooled to room temperature and crystallization, through chilled water cooling crystallization overnight, centrifugation, washing the filter cake with a small amount of acetonitrile frozen crystal, drying, 80 ° C and dried under vacuum to dryness to give prulifloxacin finished 8. 73kg, yield (mole ) 92.4percent, purity 99.5percent 7. 0kg adding the compound of formula (III) in a reaction vessel, 2. 31kg potassium bicarbonate and 42L N, N- dimethylformamide, cooling down to 4 ° C, was added dropwise at a concentration of 0. 6kg / L of formula ( V) DMF solution of compound 12. 3L, controlling the internal temperature 4 ° C, dropwise Bi, 4 ° C with stirring, and the reaction time was 5.5 hours, the reaction solution was poured into ice water with stirring, and stirred for 0.5 hours, the crystals were collected by filtration, the filter cake washed with water until neutral, drained, 60~70 ° C hot air circulation drying, a compound of formula (I) prulifloxacin crude 9. 34kg, yield (moles) 96.8 percent, purity 92.6percent; (4) was added to the reaction vessel in step (3) obtained in prulifloxacin crude acetonitrile and 358L stirred heated to reflux to dissolve transparent, coolish, adding 0. 05kg activated carbon, insulation was stirred at reflux for 30 minutes, filtered hot and the filtrate cooled to room temperature crystallization, crystallization through the chilled water cooling overnight, centrifugation, washing the filter cake with a small amount of acetonitrile frozen crystal, drying, 80 ° C under vacuum to dryness to give Cape Lu Lisha star finished 8. 94kg, yield (mol) of 95.4percent, a purity of 99.7percent
With potassium hydrogencarbonate; In N,N-dimethyl-formamide; at 0℃; for 5h;Large scale;
the reaction vessel in step (3) obtained in prulifloxacin crude acetonitrile and 358L stirred heated to reflux to dissolve transparent, coolish, adding 0. 05kg charcoal, keep stirring under reflux for 30 minutes, filtered hot and the filtrate was natural cooled to room temperature and crystallization, through chilled water cooling crystallization overnight, centrifugation, washing the filter cake with a small amount of acetonitrile frozen crystal, drying, 80 C and dried under vacuum to dryness to give prulifloxacin finished 8. 73kg, yield (mole ) 92.4%, purity 99.5% 7. 0kg adding the compound of formula (III) in a reaction vessel, 2. 31kg potassium bicarbonate and 42L N, N- dimethylformamide, cooling down to 4 C, was added dropwise at a concentration of 0. 6kg / L of formula ( V) DMF solution of compound 12. 3L, controlling the internal temperature 4 C, dropwise Bi, 4 C with stirring, and the reaction time was 5.5 hours, the reaction solution was poured into ice water with stirring, and stirred for 0.5 hours, the crystals were collected by filtration, the filter cake washed with water until neutral, drained, 60~70 C hot air circulation drying, a compound of formula (I) prulifloxacin crude 9. 34kg, yield (moles) 96.8 percent, purity 92.6%; (4) was added to the reaction vessel in step (3) obtained in prulifloxacin crude acetonitrile and 358L stirred heated to reflux to dissolve transparent, coolish, adding 0. 05kg activated carbon, insulation was stirred at reflux for 30 minutes, filtered hot and the filtrate cooled to room temperature crystallization, crystallization through the chilled water cooling overnight, centrifugation, washing the filter cake with a small amount of acetonitrile frozen crystal, drying, 80 C under vacuum to dryness to give Cape Lu Lisha star finished 8. 94kg, yield (mol) of 95.4%, a purity of 99.7%
Acetonitrile (560 ml) and potassium bicarbonate (8 gm) are added to 6- fluoro-i-methyM-oxo-y-CI-piperazinyO^H-CI .SKhiazetofS^-alquinoline-S- carboxylic acid (14 gm, obtained as per the processes described in examples 1 and 2) under stirring at 25 - 300C, the contents are cooled to 150C and then the solution of 4-bromomethyl-5-methyl-1 ,3-dioxolen-2-one (10 gm) in acetonitrile (140 ml) is added at 15 - 200C for 30 to 45 minutes. The contents are stirred for 25 hours at 25 to 300C, filtered and the resulting filtrate is distilled under vacuum. To the residue added acetonitrile (70 ml), cooled the mass to 200C and then stirred for 1 hour to 1 hour 30 minutes at 20 - 250C. Filtered the solid, washed the solid with 15 ml of chilled acetonitrile and then dried to give 16 gm of prulifloxacin crude (HPLC Purity: 98.8%).To the prulifloxacin crude (obtained above) added acetonitrile (200 ml) at 25 - 300C, the contents are heated to reflux and then refluxed for 30 minutes. To the reaction mass added activated carbon (5 gm) and refluxed for 15 minutes. The reaction mass is filtered on hi-flo bed, the resulting filtrate is cooled to 200C and then stirred for 3 - 4 hours at 20 - 250C. Filtered the solid, washed with 20 ml of acetonitrile and then dried to give 14 gm of prulifloxacin (HPLC Purity: 99.9%).
Example 1: Process for the Preparation of Prulifloxacin:Step A): A solution of 4-(bromomethyl)-5-methyl-l,3-dioxol-2-one (35.5 g, 0.184 mole) in N,N-dimethylformamide (200 ml) was added dropwise at 0 to 5 C to a stirred solution of 6-fluoro-l-methyl-4-oxo-7-piperazin-l-yl-4H-[l,3]thiazeto[3,2-alpha]quinoline-3- carboxylic acid (50 g, 0.143 mole and potassium bicarbonate (15.8 g, 0.1578 mole) in N,N-dimethylformamide (200 ml). The resulting mixture was stirred at 25 to 28C for 3 to 4 hours. After the completion of the reaction, the reaction mixture was poured into water (1250 ml). The solid obtained was filtered, washed with water (100 ml), and subsequently dissolved in a mixture of chloroform: methanol (7:3; 1250 ml). The lower organic layer was separated and water (500 ml) was added to the organic layer. A dilute aqueous solution of hydrochloric acid was added to the biphasic reaction mixture to adjust peta to 0.8 to 1.0. The reaction mixture was stirred for 15 minutes, allowed to settle and the upper aqueous layer was separated. The process was repeated twice and the aqueous layers were combined. Activated charcoal (10%) was added to the combined aqueous layer and stirred for 30 minutes, filtered and cooled to 20 to 25 C. The peta of the reaction mixture was adjusted to 6.5 to 7.0 by adding an aqueous solution of sodium bicarbonate. The solid obtained was extracted with chloroform (375 ml), stirred for 15 minutes and the organic layer was separated. The aqueous layer was further extracted with a mixture of chloroform: methanol (7:3 ratio; 50 ml). The combined organic layer was distilled under vacuum at 35 to 40 C to recover the solvent up to 125 ml. The reaction mass so obtained was stirred for 3 to 4 hours at 28 to 30 C, filtered and washed with chilled chloroform (50 ml). The wet cake obtained was dried at 45 C for 12 hours to obtain the title compound.
To a solution of 6-fluoro-1-methyl-4-oxo-7-(1-piperazinyl)-4H-[1 ,3]-thiazeto-[3,2-a]- quinoline-3-carboxylic acid of formula IV (100 gms, 0.286 moles) in 4.0 It of acetonitrile, DIPEA (70 ml , 0.402 moles)) was added at room temperature, stirred for 10 minutes. The reaction mass was cooled to 10-15C and a solution of 4-(bromomethyl)-5-methyl- 1 ,3-dioxol-2-one (formula V) in 500 ml of acetonitrile was slowly added at 10-15C over a period of 1 hour. The contents were stirred at 25-30C for 20 hour, filtered over hyflo, and the bed washed with 200 ml of acetonitrile. The solvent was distilled off completely under vacuum below 50C. Acetonitrile (100 ml) was added at 50C and the contents were stirred for 30-60 minutes. The reaction mass was slowly chilled to 0-5C and the precipitated solid was filtered, washed with acetonitrile (25 ml) and dried to yield 65 gms of prulifloxacin.
7-<4-<1-<4-(3-carboxy-6-fluoro-1-methyl-4-oxo-4H-<1,3>thiazeto<3,2-a>quinolin-7-yl)>-1-piperazinylmethyl>-2-oxopropoxycarbonyl>-1-piperazinyl>-6-fluoro-1-methyl-4-oxo-4H-<1,3>thazeto<3,2-a>quinoline-3-carboxylic acid[ No CAS ]
1,1-bis<(5-methyl-2-oxo-1,3-dioxol-4-yl)methyl>-4-(3-carboxy-6-fluoro-1-methyl-4-oxo-4H-<1,3>thiazeto<3,2-a>quinoline-7-yl)-1-piperazinium bromide[ No CAS ]
1,1-bis<(5-methyl-2-oxo-1,3-dioxol-4-yl)methyl>-4-(3-carboxy-6-fluoro-1-methyl-4-oxo-4H-<1,3>thiazeto<3,2-a>quinoline-7-yl)-1-piperazinium bromide[ No CAS ]
7-<4-<1-<4-(3-carboxy-6-fluoro-1-methyl-4-oxo-4H-<1,3>thiazeto<3,2-a>quinolin-7-yl)>-1-piperazinylmethyl>-2-oxopropoxycarbonyl>-1-piperazinyl>-6-fluoro-1-methyl-4-oxo-4H-<1,3>thazeto<3,2-a>quinoline-3-carboxylic acid[ No CAS ]
6-fluoro-1-methyl-7-<4-<(5-methyl-2-oxo-1,3-dioxol-4-yl)methyl>-1-piperazinyl>-4-oxo-4H-<1,3>thiazeto<3,2-a>quinoline-3-carboxylic acid hydrochloride[ No CAS ]
6-Fluoro-1-methyl-7-[4-(5-methyl-2-oxo-[1,3]dioxol-4-ylmethyl)-piperazin-1-yl]-4-oxo-4H-2-thia-8b-aza-cyclobuta[a]naphthalene-3-carboxylic acid 5-methyl-2-oxo-[1,3]dioxol-4-ylmethyl ester[ No CAS ]
6-Fluoro-1-methyl-7-[4-(5-methyl-2-oxo-[1,3]dioxol-4-ylmethyl)-piperazin-1-yl]-4-oxo-4H-2-thia-8b-aza-cyclobuta[a]naphthalene-3-carboxylic acid 5-methyl-2-oxo-[1,3]dioxol-4-ylmethyl ester[ No CAS ]
Compound A was obtained according to the description of Patent Document 1. The compound (15.0 g) was dissolved by heating in 560 g of acetonitrile, and crystallization was performed without adding seed crystals, whereby 11.99 g of the crystal of Compound B (in terms of the desolvate) was obtained. The crystal was subjected to DSC analysis, and as a result, the melting temperature (endothermic peak) was from ordinary temperature to 130C (desolvation), from 134 to 149C (transformation) and from 213 to 225C (degradation). (1) From the results of DSC analysis and TG analysis, the reduced amount of the mass when desolvation occurred indicates that one molecule of acetonitrile is solvated by one molecule of Compound A. When the crystal after the mass was reduced was analyzed by powder X-ray diffraction, the same chart as that of the spectrum of the type III crystal of Compound A was obtained. (2) When powder X-ray diffraction analysis was carried out for the crystal obtained by keeping the type III crystal of Compound A in the saturated vapor of acetonitrile, the results coincided with the spectral data of the crystal of Example 1. In addition, (3) the crystal from which the adhering solvent was completely removed by thoroughly drying was analyzed by gas chromatography, and as a result, acetonitrile was detected. Further, (4) for crystallization, solvents other than acetonitrile were not used. From the results described above and the like, it was found that the crystal obtained in Example 1 is an acetonitrile solvate of Compound A (Compound B). The data of the powder X-ray diffraction spectrum of the obtained crystal is shown in Fig. 3. The crystal of Compound B shows remarkable peaks at 7.3, 12.6, 14.7, 16.5, 19.2, 22.3 and 25.8. In particular, the peaks at 7.3, 14.7, 19.2 and 22.3 are characteristic. A predetermined amount of Compound A was dissolved in a predetermined amount of acetonitrile, crystallization was carried out at various supersaturation concentrations, and the obtained crystals were analyzed with a powder X-ray diffractometer. The results are shown in Table 1. Table 1 Feed concentration (C) Seed crystal Temperature at the time of occurrence of spontaneous nucleus or addition of seed crystals (C) Solubility at the time of occurrence of spontaneous nucleus or addition of seed crystasl (Cs) Supersaturation concentration (Cx) Precipitated crystal form 2.14 Non 25 0.29 1.85 B+I 2.44 Non 25 0.29 2.15 B 2.40 Non 17 0.19 2.21 B 2.40 Non 14.3 0.16 2.24 B 2.68 Non 27 0.32 2.36 B 3.66 Non 0 0.07 3.59 II 2.32 III 50 1.00 1.32 B+I 1.80 III 25 0.29 1.51 B+I 1.89 III 25 0.29 1.60 B 2.00 III 25 0.29 1.71 B 2.14 III 25 0.29 1.85 B 2.21 III 25 0.29 1.92 B 2.39 III 30 0.38 2.01 B 2.41 III 25 0.29 2.12 B 2.68 III 25 0.29 2.39 B 2.73 III 25 0.29 2.44 B 2.36 B 70 2.36 0.00 B+I 0.70 B 25 0.29 0.41 B 2.36 B 65 1.92 0.44 B 1.34 B 45 0.79 0.55 B 1.07 B 30 0.38 0.69 B 1.61 B 45 0.79 0.82 B 1.25 B 25 0.29 0.96 B 1.43 B 30 0.38 1.05 B 2.36 B 55 1.25 1.11 B 1.52 B 25 0.29 1.23 B 1.75 B 30 0.38 1.37 B 1.75 B 25 0.29 1.46 B 2.36 B 45 0.79 1.57 B 1.96 B 25 0.29 1.67 B 2.10 B 30 0.38 1.72 B 2.14 B 25 0.29 1.85 B 2.36 B 30 0.38 1.98 B 2.36 B 25 0.29 2.07 B 2.41 B 25 0.29 2.12 B In Table 1, I indicates the type I crystal of Compound A, II indicates the type II crystal of Compound A, III indicates the type III crystal of Compound A, and B indicates the crystal of Compound B.
at 50 - 80℃; under 20.0 Torr; for 24h;Neat (no solvent);Product distribution / selectivity;
The crystal of Compound B (9.8 g) was dried for 24 hours at 50C under a reduced pressure (20 mmHg) for desolvation (with a yield of 9.0 g) . The crystal was subjected to DSC analysis, and as a result, the melting temperature (endothermic peak) was from 134 to 149C (transformation) and from 213 to 225C (degradation). When comparing the results of DSC analysis of the crystals obtained in Reference Example 1, Reference Example 2 and Example 3, the crystal obtained in this Reference Example corresponded to the type III crystal of Compound A. The obtained data of the powder X-ray diffraction spectra is shown in Fig. 4. The crystal of Compound B shows remarkable peaks at 7.5, 8.1, 13.7, 17.5 and 26.1. This chart of spectrum coincided with the X-ray diffraction spectra of the type III crystal of Compound A in Non-patent Document 1.
In acetonitrile; at 80℃;Purification / work up;
The crystal of Compound B was added to acetonitrile in an amount of not less than the supersaturation concentration at a predetermined temperature (in a state where not all the added crystals are dissolved and some crystals are present), stirred for 30 minutes, and then the crystal was filtered and measured with a powder X-ray diffractometer. The results are shown in Table 4. Table 4 Temperature (C) Crystal form 25 Not changed 40 Not changed 55 Not changed 67 Not changed 80 Contaminated by the type I crystal of Compound A As shown in Table 4, it was found that at 67C or lower, transformation from the crystal of Compound B to another crystal was not observed, however, at 80C, a part of the crystal of Compound B was transformed to the type I crystal of Compound A.
In ethanol; chloroform; for 0.5h;Heating / reflux;Purification / work up;
Step B): The prulifloxacin (30 g) obtained in Step A) was suspended in a mixture of chloroform: ethanol (10:1, v/v, 585 ml: 58.5 ml) and heated to reflux temperature. Activated carbon (3.9 gm) was added to the partially cleared solution and refluxed for 30 minutes, followed by filtration through Celite bed. The bed was further washed with chloroform: ethanol (10:1, v/v, 585 ml: 58.5 ml). The filtrate so obtained was distilled at atmospheric pressure till to partially remove the solvent. The concentrate so obtained was stirred at about 25 C for 1 hour, and filtered. The solid obtained was washed with chloroform: ethanol (39 ml X 2), dried under vacuum at 45 C for 12 hours to obtain the title compound. Yield: 22 gHPLC Purity: 99%
22
6-fluoro-1-methyl-7-[4-(5-methyl-2-oxo-1,3-dioxolen-4-yl)methyl-1-piperazinyl]-4-oxo-4H-[1,3]thiazeto[3,2-a]quinoline-3-carboxylic acid hydrochloride[ No CAS ]
[ 123447-62-1 ]
Yield
Reaction Conditions
Operation in experiment
With triethylamine; In methanol; dichloromethane; at 0 - 5℃; for 1.5h;Product distribution / selectivity;
Method C: Dichloromethane and methanol (10:1,100ml) were added to prulifloxacin hydrochloride (1Og) and the reaction mixture was cooled to 0-50C. Triethylamine (2.03g) was added to the reaction mixture at 0-50C and slowly stirred for 1.5 hours. The reaction mixture was filtered, washed with water and isopropyl alcohol, and then dried to obtain 6g of the title compound having purity 99.48 % by HPLC. Example 13: Purification of PrulifloxacinPrulifloxacin (15g, 93.73% purity by HPLC) in dimethylformamide (13.5 ml) was heated to 110 to 115 0C for 1 hour and cooled to 20- 25 0C. The mixture was stirred for 2 hours, filtered and washed with dimethylformamide and isopropyl alcohol to give 12.27 g of the title compound having purity 98.46% by HPLC. Above compound was further purified in dimethylformamide(9.0 ml) in the same way to obtain give 8.5 g of the title compound having purity 99.55% byHPLC.
In N,N-dimethyl-formamide; at 0 - 85℃; for 5h;Purification / work up;
<strong>[123447-62-1]Prulifloxacin</strong> (65 gms) was added to 200 ml of DMF at 25-30C and heated to 80-85C for 1 hour. The mixture was then slowly cooled to 25-30C, stirred for 2 hours, chilled to 0-5C for 2 hours. The precipitated solid was filtered and dried under vacuum at 70- 75C to yield Type I crystals of <strong>[123447-62-1]prulifloxacin</strong> (55 gms, 99.5 % HPLC purity).
24
ethyl 5,6-difluoro-1-methyl-4-oxo-4H-<1,3>thiazeto<3,2-a>quinoline carboxylate[ No CAS ]
6-fluoro-1-methyl-7-[4-(5-methyl-2-oxo-[1,3]dioxol-4-ylmethyl)piperazin-1-yl]-4-oxo-4H-2-thia-8b-aza-cycobuta[a]naphthalene-3-carboxylic acid 1-chloromethyl-2-(2-methyl-5-nitro-imidazol-1-yl)ethyl ester[ No CAS ]
Yield
Reaction Conditions
Operation in experiment
65%
With dmap; benzotriazol-1-ol; dicyclohexyl-carbodiimide; In N,N-dimethyl-formamide; at 20℃; for 16h;
Example 5: Synthesis of DART molecule 94 from Table IB Synthesis of 0-Fhioro-]-methyI-7-[4-(5-methyl-2-oxo-[l,3]dioxol-4- ylmeihyi)-piperazin~l-yi} '-4-oxo-4 H~2-lhia-8h~Qza-cycobuiQ[ ]naphth lene-3- carboxyiic acid l-chloromethyl~2-(2-meihyl~5~nitro-imidazol~l-yl)-ethyl ester (5): To a stirred solution of 6-Fluoro- l -methyl-7-[4-(5-methyl-2-oxo-[l,3]dioxol-4- ylmethyl)-piperazin-l-yl]-4-oxo-4H-2-thia-8b-aza-cyclobuta[a]naphthalene-3- carboxylic acid, (V) (0.5g, l .OSmmol) in DMF (20ml) was added DCC (0.3g, 1.41 mmol) and HOBt (0.146g, 1.083mmoi) followed by addition of l-Chloro-3-(2- methyl-5-nitro-imidazol-l -yl)-propan-2-ol, (I) (0.285g, 1,3 mmol) and DMAP (0.13g, 1.08 mmol) at room temperature. The reaction mixture was stirred at RT for 16 h. The precipitate was removed by filtration and the organic layer was evaporated to get the crude mass. Finally it was purified by flash column chromatography euting with 2-4 % methanol/dichloromethane mixture to obtain the pure compound, (5), i.e., Compound 94 from Table 1, with 60% isolated yield. FontWeight="Bold" FontSize="10" H-NMR (400 MHz, D SO) 6ppm: 2.03 (3H, d, J=5.6Hz, CH3), 2.12 (3H, s, CH3), 2.5 (3H, s, CH3), 2.62 (4H, m, 2 x CH2), 3.22 (4H, m, 2 x CH2), 3.95-4.06 (2H, m, CH2C1), 4.49-4.52 (1H, t, J - 10 Hz, CHN) 4.77 (1H, d, J = 13.2Hz, CHN)? 5.63(1H, d, J = 4.4Hz, CHOCO), 6.15 (1H, m, CHSN), 6.78 (1H, d, J = 7.2, Ar-H), 7.68 (1H, d, 7 = 14, Ar-H), 7.9 (1H, s, Ar-H).
Step 2. Synthesis of DART, 9: To a solution of 3 (0,72g, 1.55mmol) in mixture of dichloromethane (10ml) and dimethylformamide (1 ml) was added dicyclohexyleafbodiimide (0.415g, 2.05mmol) followed by N- Hydroxybenzatriazole (0.209g, 1.55mmol) at RT to provide turbid suspension. The reaction mixture was stirred for 3 hr at RT and compound 2 (0.79g, 1.55mmol) was added to this turbid solution followed by addition of 4- dimethylaminopyridine (0.189g 1.55mmol). The final solutionwas stirred at RT for 16h. The precipitate was filtered, and the filtrate was extracted with ethyl acetate. The organic layer was washed with brine solution and dried over sodium sulphate to obtain the crude product. The cmde product was purified by flash column chromatography to get the final product (9) in 50-60% isolated yield.