Diethyl chlorophosphate → HCID 44572352, compound

Participants

Reaction Steps

A stirred solution of 3.8 g (0.01 mol) of 7-iodo-1,3-dihydro-5-(2-fluorophenyl)-2H-1,4-benzodiazepine-2-one in 50 ml of dimethyl formamide was cooled in an ice bath under an atmosphere of nitrogen. Potassium t-butoxide, 1.29 g (0.0115 mol) was added and after stirring for 5 minutes, 2.59 g (0.015 mol) of diethyl chlorophosphate was added and the stirring was continued for 5 minutes. A mixture of 2.26 g (0.02 mol) of ethyl isocyanoacetate in 50 ml of dimethylformamide that had been treated with 2.24 g (0.02 mol) of potassium t-butoxide just prior to the addition, was then added. After 5 minutes the ice bath was removed and the stirring was continued for 3 hours. The mixture was acidified with 2 ml of glacial acetic acid, diluted with 200 ml of saturated sodium bicarbonate solution and extracted with two 125 ml portions of toluene which were dried and evaporated. The residue was crystallized from ethyl acetate. For analysis, the crude product was chromatographed over silica gel using methylene chloride/ethyl acetate 1:1 (v/v) and then crystallized from ethyl acetate/hexane to give pure product with mp 200°-202°.

Provenance & Evidence