Phosgene → HCID 18350625, compound

Participants

Reaction Steps

A solution of 1.0 g (2.93 mmol) of 8-hydroxymethyl-5-(4-nitrophenyl)-8,9-dihydro-7H-1,3-dioxolo[4,5-h][2,3]-benzodiazepine is mixed in succession with 0.98 ml (7.03 mmol) of triethylamine and 2.23 ml (3.52 mmol) of a 15.6% phosgene solution in toluene while being stirred and cooled. Then, the reaction mixture is heated for 3 hours to 25° C. The precipitate of the crude product is separated, the filtrate is concentrated by evaporation and the residue is treated with water. The combined residues are boiled with ethanol, and after suctioning-off, 0.72 g (67%) of the title compound with a melting point >250° C. (decomposition) is obtained.

Provenance & Evidence