Acetic Acid → (+/-)-7-(4-Carboxythiazol-2-yl)-8-methyl-5-(4-nitrophenyl)-8,9-dihydro-7H-1,3-dioxolo[4,5-h][2,3]benzodiazepine

Participants

Reaction Conditions

Reaction Steps

A mixture of 9 ml of ethanol, 0.85 g (1.89 mmol) of (±)-7-(4-ethoxycarbonyl-thiazol-2-yl)-8-methyl-5-(4-nitrophenyl)-8,9-dihydro-7H-1,3-dioxolo[4,5-h][2,3]benzodiazepine (Example 8) and 7 ml of 1N sodium hydroxide solution was stirred at 90° C. After cooling, it was acidified with acetic acid, diluted with water and the precipitated crystals were filtered off, washed with water and dried to yield 0.78 g (98%) of the title compound; Mp.: >260° C.

Provenance & Evidence