4-hydroxy-3-methyl-6a,7,8,9-tetrahydro-5H-pyrrolo[2,1-c][1,4]benzodiazepine-6,11-dione → HCID 20301691, compound

Participants

Reaction Steps

2.0 g of 2,3,5,10,11,11a-hexahydro-9-hydroxy-8-methyl-1H-pyrrolo[2,1-C] [1,4]benzodiazepin-5,11-dione was admixed with 300 ml of benzaldehyde dimethyl acetal and heated at 190° to 200° C. for 2 hours with stirring under a stream of nitrogen gas. The liquid reaction mixture was concentrated at 130° to 150° C. under reduced pressure. The concentrate was dissolved in a small quantity of chloroform, passed through a silica gel chromatographic column and eluted with ether. Thus, there was obtained 2.4 g of 6,8,9,10,10a,11-hexahydro-3-methyl-1-phenyl-1H-oxazolo[5,4,3-jk]pyrrolo[2,1-C] [1,4]benzodiazepin-6,11-dione as a colorless crystal. Recrystallization of the resulting product from ether gave a colorless needle-like crystal having a melting point of 158.5° to 162.5° C.

Provenance & Evidence