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Synthesis and reactions of 1-cyclopropyl-1,3-bis(trimethylsilyloxy)-1,3-buatdiene
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A cyclopropyl-substituted 1,3-bis(silyl enol ether) was prepared in two steps and subsequently employed in the cyclization with oxalyl chloride to give a cyclopropyl-carbonyl substituted -alkylidenebutenolide. The cyclization of the 1,3-bis(silyl enol ether) with 1,3-dielectrophiles afforded cyclopropyl-carbonyl substituted phenols. The reactions proceeded with very good regioselectivity. |