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[Referential Example 119]; 1-Benzylhexahydro-1H-1,4-diazepin-5-one ; [] Concentrated sulfuric acid (25 mL) was added to 1-benzyl-4-piperidone (10.14 g) in acetic acid (50 mL) at room temperature, and sodium azide (3.880 g) was added thereto at 0C over a period of 2 hours, followed by stirring at 5C for 25 hours. The reaction mixture was alkalinized through addition of aqueous sodium hydroxide, followed by partitioning by use of chloroform. The aqueous layer was extracted with chloroform. The organic layers were combined, and washed with saturated brine, and then dried over sodium sulfate anhydrate, followed by filtration. The solvent was evaporated under reduced pressure, and then the residue was purified through silica gel column chromatography (chloroform - methanol), to thereby give the title compound as a solid (5.081 g, 47%).1H-NMR(400MHz,CDCl3)delta: 2.50-2.70(6H,m), 3.20-3.35(2H,m), 3.60(2H,s), 6.07(1H,br), 7.20-7.40(5H,m). MS(ESI)m/z: 205(M+H)+.
Step 2: Synthesis of l-benzyl-l,4-diazepan-5-one [142]To a clean and dried two necked round bottom flask [141] (2 g, 0.00976 mol) was dissolved in acetone (20 ml) and acetonitrile (20 ml). The reaction mixture was cooled to 0 C, and then to it 15 % aqueous NaOH ( 1.2 ml) was added drop wise, followed by the addition of benzene sulphonyl chloride (1.49 ml, 0.01 1 mol). The reaction mixture was refluxed overnight. TLC showed complete consumption of SM. The reaction mixture was diluted with acetone, and passed through celite and concentrated. Saturated NaHC03 (50 ml) was added to the solid followed by extraction with EtOAc (3 X 150 ml), removal of the solvent under reduced pressure. The residue was purified by column chromatograph on silica gel with MeOH:DCM (1%) as an eluent to afford [142] as a white solid (600 mg, 30 %).ESIMS: 205 (M+ + 1)
30%
With benzenesulfonyl chloride; sodium hydroxide; In water; acetone; acetonitrile; at 0℃;Reflux;
Step 2 To a clean and dried two necked round bottom flask [110] (2 g, 9.76 mmol) was dissolved in acetone (20 ml) and acetonitrile (20 ml). The reaction mixture was cooled to 0 (>C, and then to it 15 % aqueous NaOH ( 1.2 ml) was added drop wise, followed by the addition of benzene sulphonyl chloride ( 1.49 ml, 1 1 mmol). The reaction mixture was refluxed overnight. TLC showed complete consumption of SM. The reaction mixture was diluted with acetone, and passed through celite and concentrated. Saturated NaHCOj (50 ml) was added to the solid followed by extraction with EtOAc (3 X 150 ml), removal of the solvent under reduced pressure. The residue was purified by column chromatography on silica gel with MeOH: DCM ( 1 ) as an eluent to afford [111] as a white solid (600 mg, 30 ). , ESIMS: 205 (M+ + 1 )
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