3-Methyl-2-butenoic acid → cis-4,4-Dimethyloctahydrocyclopenta[b][1,4]diazepin-2-one

Participants

Reaction Steps

A toluene (200 mL) suspension of cis-cyclopentane-1,2-diamine (19.7 g, 197 mmol) and 3-methyl-2-butenoic acid (19.7 g, 197 mmol) was stirred under reflux for 24 hours under azeotropic conditions using a Dean-Stark apparatus. The reaction mixture was cooled to room temperature and then concentrated under reduced pressure, and the deposited crystal was collected by filtration. The obtained crystal was washed with ether and then dried to obtain cis -4,4-dimethyloctahydrocyclopenta[b][1,4]diazepin-2-one (8.60 g, 24%) in a light brown powder form.

Provenance & Evidence