Phosgene → N-(4-isocyanato-benzyl)-2,2-dimethyl-propionamide

Participants

Reaction Conditions

Reaction Steps

To a solution of phosgene (24.1 ml of a 1.93 M solution in toluene, 46.5 mmol) in methylene chloride (50 ml) cooled to 0° C. is added dropwise a solution of N-(4-amino-benzyl)-2,2-dimethyl-propionamide (8 g, 38.8 mmol) and triethyl amine (13.5 ml, 97 mmol) in methylene chloride (80 ml). The reaction mixture is allowed to slowly warm to 25° C. and stirred at this temperature for 18 hrs. The reaction mixture is filtered on dry cellite, under an argon atmosphere and the filtrate is concentrated in vacuo. The residue is dissolved in methylene chloride (380 ml) to provide a 0.1 M solution of N-(4-isocyanato-benzyl)-2,2-dimethyl-propionamide in methylene chloride which is used as is.

Provenance & Evidence