Phosgene → 3-(6-Methoxy-m-tolyl)-1,2-benzisothiazol-5-yl isocyanate

Participants

Reaction Steps

A solution of 5-amino-3-(6-methoxy-m-tolyl)-1,2-benzisothiazole (157 g, 0.581 mol) in toluene is treated with phosgene (1,074 mL of a 20% solution in toluene, 2.06 mol), heated to and stirred at reflux for 5 hours, treated with additional phosgene (100 mL of a 20% solution in toluene), refluxed overnight, and concentrated in-vacuo to give the title product as a yellow-orange solid (169 g, 98.2%) which is identified by NMR spectral analyses.

Provenance & Evidence