Phosgene → 2-(4,5-Dihydro-4-methyl-5-oxo-1,3,4-oxadiazol-2-yl)benzenesulfonyl isocyanate

Participants

Reaction Steps

A suspension of 8 g of the product of Example 7 and 0.4 g of DABCO in 90 ml of xylenes was heated under N2 at 130°-135° C. while 1.8 ml of phosgene was added portionwise at a rate to maintain a reflux temperature of about 130°-135° C. The mixture was refluxed an additional two hours, cooled under N2 to room temperature, filtered, and the filtrate was concentrated in vacuo to yield 6.9 g of the subject compound as a crude oil.

Provenance & Evidence