Ring transformation of 4-acylmethyl-2-chloro-4-hydroxy-2-cyclobutenone to γ-acylmethylenetetronate by thermal rearrangement: New synthetic aspect of squaric acid as a C4-synthon
作者:Yoshihiko Yamamoto、Masatomi Ohno、Shoji Eguchi
DOI:10.1016/s0040-4020(01)85262-5
日期:1994.1
TiCl4-catalyzed addition of a silyl enol ether to squaric acid dichloride and ester chloride were subjected to thermolysis (reflux in an aromatic solvent), and γ -acylmethylenetetronates were obtained stereoselectively with (Z)-geometry via an α,β unsaturated chloroketene intermediate. The mechanism, application of this novel rearrangement to synthesis of basidalin and related photolysis were described
将由TiCl 4催化的甲硅烷基烯醇醚加到方酸二氯化物和酯氯化物中制备的标题环丁烯酮进行热分解(在芳族溶剂中回流),然后通过(Z)几何结构通过α立体选择得到γ-酰基亚甲基四酸酯,β不饱和氯乙烯中间体。描述了这种新颖的重排在basidalin合成和相关光解中的机理,应用。