Regio- and Stereoselective Synthesis ofγ-Alkylidenebutenolides by Cyclization of Dilithiated 1,3-Dicarbonyl Compounds withN,N′-Dimethoxy-N,N′-dimethylethane- diamide
摘要:
The remarkably simple synthesis of γ-alkylidenebutenolides 3 is achieved by cyclization of the dilithiated 1,3-dicarbonyl compounds 1 with N,N'-dimethoxy-N,N'-dimethylethanediamide (2). This regio- and stereoselective cyclization provides a route to a wide range of butenolides, which are of pharmacological relevance and of importance for natural product synthesis.