Phosgene → 4-Isocyanato-7-methoxy-4,5,6,7-tetrahydro-1-benzothiophene

Participants

Reaction Steps

A 1 g sample of 4,5,6,7-tetrahydro-7-methoxybenzo[b]thiophen-4-amine is added to 18 ml of 12.5% phosgene solution (benzene) in a nitrogen atmosphere at 20° C. After stirring at room temperature for an hour, the mixture is heated to 60° C and kept at this temperature for 7 hours. The mixture is cooled to room temperature and evaporated to dryness in vacuo to afford the crude 4,5,6,7-tetrahydro-7-methoxybenzo[b]thien-4-ylisocyanate.

Provenance & Evidence