Synthesis of 4-Alkyl- and 4-(ω-Chloroalkyl)-3-hydroxy-5-alkylidenebuten­olides Based On Cyclizations of 4-Alkyl- and 4-(ω-Chloroalkyl)-1,3-bis(tri­methylsilyloxy)buta-1,3-dienes with Oxalyl Chloride

Abstract

4-Alkyl- and 4-(ω-chloroalkyl)-1,3-bis(trimethylsilyl­oxy)buta-1,3-dienes were prepared from ethyl acetoacetate in three steps. Their cyclization with oxalyl chloride allowed an efficient synthesis of 4-alkyl- and 4-(ω-chloroalkyl)-5-alkylidenebuten­olides.

butenolides - cyclizations - O-heterocycles - silyl enol ethers

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