Regio- and stereoselective synthesis of γ-alkylidenebutenolides and γ-alkylidenephthalides has been achieved through the palladium-catalysed tandem cross-coupling/cyclisation reactions of tributylstannyl-3-iodopropenoate or the 2-iodo benzoate derivatives with tributyltinacetylene. Iododestannylation occurred with inversion of the configuration of the exocyclic double bond in the case of butenolides, but with retention of configuration for the phthalide. The selectivity observed in the Stille reaction was found to be dependent on the nature of the vinyl or the aryl halide.
已通过
钯催化的串联交叉耦合/环化反应合成了γ-烷基烯烃内酯和γ-烷基烯酰内酯,反应底物为三
丁基锡-3-
碘丙烯酸酯或
2-碘苯甲酸酯衍
生物与三
丁基锡炔的反应。在烯酮内酯的情况下,
碘去
锡反应发生了外环双键构型的反转,而在
酞内酯中则保持构型。观察到的斯蒂尔反应选择性与
乙烯基或芳基卤化物的性质有关。