Stevens rearrangement of a potentially aromatic thiophenium ylide: formation of 10-methoxycarbonyl-10H-benzo[3,4]cyclopenta[1,2-b]thiopyran-9-one
Abstract
The title compound (3) has been obtained by rhodium(II) catalysed decomposition and cyclization of methoxycarbonyl[2-(2′-thienyl)benzoyl]diazomethane (2) followed by spontaneous Stenves rearrangement of the initialy formed sulphur ylide (1).