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Structure of Nitrosobenzene
CAS No.: 586-96-9
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The BI-3802 was designed by Boehringer Ingelheim and could be obtained free of charge through the Boehringer Ingelheim open innovation portal opnMe.com, associated with its negative control.
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CAS No. : | 586-96-9 |
Formula : | C6H5NO |
M.W : | 107.11 |
SMILES Code : | O=NC1=CC=CC=C1 |
MDL No. : | MFCD00002059 |
InChI Key : | NLRKCXQQSUWLCH-UHFFFAOYSA-N |
Pubchem ID : | 11473 |
GHS Pictogram: |
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Signal Word: | Danger |
Hazard Statements: | H301-H312-H332 |
Precautionary Statements: | P261-P264-P270-P271-P280-P302+P352-P304+P340-P310-P330-P363-P405-P501 |
Class: | 6.1 |
UN#: | 2811 |
Packing Group: | Ⅲ |
* 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.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
65% | With pyridine; tetramethyl ammoniumhydroxide; at 80℃; for 1h; | General procedure: A solution of nitrosobenzene (1.3 mmol, 1.3 eq.) in pyridine (4 ml) was added dropwise into the mixture of tetramethylammonium hydroxide (25%w/w, 2 ml) and aminopyridine (1 mmol, 1 eq.) in pyridine (2 ml) over 60 min at 80 C. The solution was allowed to cool to room temp. and extracted with toluene (3 × 10 mL). The combined organic layers were washed with brine (10mL), dried (Na2SO4) and concentrated in vacuo. Flash column chromatography afforded the corresponding diazo-compound. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With L-proline; In acetonitrile; at -10℃; | General procedure: To a stirred precooled (?10 °C) MeCN (25 mL) solution of beta-amino aldehydes 6a?f (17 mmol) and nitrosobenzene (13.6mmol) was added L-proline (0.039 g, 20 molpercent). The reactionmixture was allowed to stir at the same temperature for 20 hfollowed by the addition of MeOH (10 mL) and NaBH4 (25mmol) to the reaction mixture, which was stirred for further 10min. After addition of phosphate buffer, the resulting mixturewas extracted with EtOAc (3 × 30 mL), the combined organicphases were dried over anhydrous Na2SO4 and concentrated togive the crude aminooxy alcohol, which was directly taken upfor the next step without purification. To a MeOH (25 mL) solutionof the above crude aminooxy alcohol was addedCu(OAc)2·H2O (2.6 mmol) at 25 °C, and the reaction mixture wasallowed to stir for 10 h at that temperature. After addition ofphosphate buffer, the resulting mixture was extracted withCHCl3 (3 × 30 mL), and the combined organic phases were driedover anhydrous Na2SO4 and concentrated to give the crudeproduct, which was then purified by column chromatographyover silica gel using PE?EtOAc to give 3-amino-1,2-alkane diols1a?f. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With acetic acid; In toluene; at 60℃; for 21h;Inert atmosphere; | General procedure: A solution of amine (1.00 equiv) in toluene (7 mL/mmol) was degassed with a nitrogen stream for 15 min. Then, the nitroso compound (1.00 equiv) and acetic acid (4.00 equiv) were added. The mixture was stirred at 60 °C for 21 h. The residue was purified by flash column chromatography (SiO2, hexane/EtOAc, 7:1), followed by distillation under vacuum to afford corresponding 2-(phenyldiazenyl) aniline. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
56% | With caesium carbonate; 9-(2-mesityl)-10-methylacridinium perchlorate; In dichloromethane; for 1h;Irradiation; Inert atmosphere; Sealed tube; | General procedure: A dry tube equipped with a stirring bar was charged with the carboxylic acid 1a-l (0.2 mmol, 1.0 equiv), 2a (4.0 mg, 10 mumol, 5 mol%), Cs2CO3 (66 mg, 0.1 mmol, 1.0 equiv), and the requisite nitrosoarene (0.4 mmol, 2.0 equiv). The tube was capped with a Supelco aluminum crimp seal with septum (PTFE/butyl) and it was evacuated and refilled with N2 (3 ×). CH2Cl2 (anhydrous and degassed by bubbling through with N2 for 20 min; 4.0 mL) was added. The N2 inlet was then removed and the cap sealed with parafilm. The mixture was stirred at r.t. for 1 h in front of blue LEDs. The tube was opened to air and the mixture was diluted with CH2Cl2 (5 mL) and brine (5 mL). The layers were separated and the aqueous layer was extracted with CH2Cl2 (3 × 5 mL). The combined organic layers were dried (MgSO4), filtered, and evaporated. Purification by column chromatography on silica gel gave 3a-o. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
77% | With acetic acid; at 40℃; | A solution of <strong>[84832-02-0]methyl 3-amino-2,6-difluorobenzoate</strong> (6.60mmol, 1.23g, Combi-Blocks) and nitrosobenzene (6.00mmol, 642mg) in acetic acid (30mL) was heated at 40C overnight. Afterwards, the reaction mixture was diluted with diethyl ether (200mL) and washed with 1N aq. HCl (2×150mL), sat. aq. NaHCO3 (150mL) and brine (150mL). The organic phase was dried (MgSO4) and filtered through a plug of silica. The volatiles were removed in vacuo and to the residue was added hot pentane (200mL). The resulting suspension was filtered and the volatiles were removed to provide product as red powder (1.27g, 77%). Rf=0.50 (pentane/Et2O, 1:1, v/v); Mp. 78-79C; 1H NMR (400MHz, CDCl3): δ 4.02 (s, 3H), 7.01-7.06 (m, 1H), 7.50-7.55 (m, 3H), 7.90-7.96 (m, 3H); 13C NMR (100MHz, CDCl3): δ 53.0, 112.2 (dd, JC-F=4.2Hz, JC-F=23.2Hz), 120.8 (dd, JC-F=2.0Hz, JC-F=10.7Hz), 123.2, 129.2, 131.8, 137.5 (dd, JC-F=4.1Hz, JC-F=6.3Hz), 152.2, 160.0 (dd, JC-F=6.5Hz, JC-F=268Hz), 161.5, 161.8 (dd, JC-F=5.7Hz, JC-F=262Hz); 19F NMR (376MHz, CDCl3):-120.5 (m),-105.9 (m); HRMS (ESI+) calc. for [M+H]+ (C14H11F2N2O2): 277.0783, found: 277.0783. |