Potassium Cyanide → Cyclopropylmethyl 8-chloro-9-oxo-12,12a-dihydro-9H,11H-azeto[2,1-c]imidazo[1,5-a][1,4]benzodiazepine-1-carboxylate

Participants

Reaction Steps

A mixture of 8.0 g (24 mmol) of ethyl (S)-8-chloro-12,12a-dihydro-9-oxo-9H,11H-azeto[2,1-c]imidazo[1,5-a][1,4]benzodiazepine-1-carboxylate, 0.5 g (7.7 mmol) of potassium cyanide and 60 ml of hydroxymethyl-cyclopropane is stirred at 130° for 5 hours, during this time a small amount of solvent being distilled off four times by the application of a slight vacuum. The mixture is subsequently evaporated in vacuo, the residue is partitioned between water and methylene chloride and the aqueous phase is extracted twice with methylene chloride. The combined organic extracts are washed three times with saturated sodium chloride solution, dried over magnesium sulphate and evaporated. The crude product is crystallized from ethyl acetate and there is obtained cyclopropylmethyl (S)-8-chloro-12,12a-dihydro-9-oxo-9H,11H-azeto[2,1-c]imidazo[1,5-a][1,4]benzodiazepine-1-carboxylate of decomposition point 183°-185° (partially racemized).

Provenance & Evidence