Ethylenediamine → Hexahydro-7-methyl-5H-1,4-diazepin-5-one

Ethane-1,2-diamine (1.35 g, 22.44 mmol) and (E)-ethyl but-2-enoate (2.56 g, 22.44 mmol) in MeOH (22 mL) was stirred at room temperature overnight. Solvent was evaporated under reduced pressure and crude product purified by chromatography on silica gel with a gradient of DCM to DCM:2M NH3/MeOH (4:1, v/v) as eluent. This afforded a mixture of desired product and uncyclised material. The mixture was diluted with MeOH (4 mL) and heated in the microwave at 150° C. for 10 min followed by 160° C. for 10 min. Sodium bicarbonate (100 mg) was added and the reaction mixture stirred at room temperature for 48 h. The reaction mixture was filtered, solvent evaporated under reduced pressure and crude product purified by chromatography on silica gel with a gradient of DCM to DCM:2M NH3/MeOH (4:1, v/v) as eluent to afford 7-methyl-1,4-diazepan-5-one (310 mg, 2.42 mmol, 11%).

1. customSolvent was evaporated under reduced pressure and crude product
2. custompurified by chromatography on silica gel with a gradient of DCM to DCM
3. customThis afforded

ORD record

ord-2cb4534acfdc41f9a4962bfbeef0f4fa

Source dataset

uspto-grants-2010_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07820649B2