(-)-1-(N-methylanthraniloyl)-proline → 10-methyl-2,3-dihydro-1H-pyrrolo[2,1-c][1,4]benzodiazepine-5,11(10H,11aH)-dione

Participants

Reaction Steps

A mixture of 24.8 g. of racemic 1-(N-methylanthraniloyl)proline and 21 g. of dicyclohexylcarbonyl diimide in 300 ml. of tetrahydrofuran is stirred at room temperature for 24 hours and then heated on the steam bath for 4 hours. The reaction mixture is filtered to remove the insoluble dicyclohexyl urea and the mother liquid is concentrated to recover the desired product, which is further purified by recrystallization from ethyl acetate.

Provenance & Evidence