Regio- and stereoselective preparation of γ-alkylidenebutenolides or α-pyrones using a Stille reaction and palladium-catalysed oxacyclisation sequence

Synthesis of butenolides or alpha-pyrones from substituted tributylstannyl acetylides is highly dependant on the nature of the acetylide. (C) 2003 Elsevier Ltd. All rights reserved.