1,2-Dimethoxyethane → HCID 54094583, compound

Participants

Reaction Conditions

Reaction Steps

To a cooled (0° C.) suspension of 8.53 parts of lithium aluminum hydride in 392 parts of 1,2dimethoxyethane there were added dropwise 20.19 parts of (S)-7-chloro-3,4-dihydro-3-methyl-1H-1,4-benzodiazepine-2,5-dione (prepared as intermediate 43) under argon. The mixture was left at room temperature for 3 hours and was then refluxed for 29 hours. After cooling to 0° C., there were added successively a mixture of 8.5 parts of water and 22.7 parts of tetrahydrofuran, 9.86 parts of NaOH (15%) and 25.5 parts of water. The whole was stirred for 24 hours and was then filtered. The precipitate was refluxed in 178 parts of tetrahydrofuran for 5 min and filtered off again. The combined filtrates were evaporated and the residual oil crystallized on standing, yielding 18.4 parts (100%) of (S)-7-chloro2,3,4,5-tetrahydro-3-methyl-1H-1,4-benzodiazepine (interm. 59).

Provenance & Evidence