Abstract
Benzoyl isothiocyanate reacts with dialkyl acetylenedicarboxylates in the presence of triphenylphosphine in a mechanistically novel reaction to afford highly substituted dialkyl 2-(benzoylimino)-5-phenyl-4 H-[1,3]dithiolo[4,5- b]pyrrole-4,6-dicarboxylates with double insertion of the isothiocyanate. The reaction proceeds via a carbon to nitrogen migration of an alkoxycarbonyl group.
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