摘要:
The cycloaddition of activated alkynes, among them 6-alkynylpterins, with the tributylphosphine-carbon disulfide complex followed by a Wittig reaction of the resulting ylid with carbonyl compounds or nitrosobenzene affords novel 2-alkylidene- or 2-(phenylimino)-1,3-dithioles in moderate to very good yields. The pterin-substituted species are potential intermediates in the synthesis of the molybdenum cofactor.