Alkoxydienylstannanes via metalation of α,β-unsaturated and α-phenyl acetals: preparation and synthetic uses in the Stille cross-coupling reaction
作者:Paolo Balma Tivola、Anna Deagostino、Cristina Prandi、Paolo Venturello
DOI:10.1039/b007500k
日期:——
Treatment of α,β-unsaturated (1 and 2) and α-phenyl (3) acetals with an equimolar mixture of butyllithium and potassium tert-butoxide (Schlosserâs reagent LICâKOR) gives α-metalated 1,3-dienes and vinyl ethers that readily react with chlorotributyltin affording (Z)-functionalized alkoxyvinylstannanes 4â6. Stille cross-coupling reaction between these reactants and allyl bromide, iodobenzene, or benzoyl chloride produces derivatives 7â13 that can be moreover converted into carbonyl compounds 14â19 according to an umpolung approach.
用丁基锂和叔丁醇钾的等摩尔混合物(Schlosserâs 试剂 LICâKOR)处理δ,δ-不饱和(1 和 2)和δ-苯基(3)乙醛,可得到δ-金属化的 1,3-二烯和乙烯基醚,它们很容易与氯代三丁基锡反应,生成 (Z) 功能化的烷氧基乙烯基锡 4â6。这些反应物与烯丙基溴、碘苯或苯甲酰氯发生斯蒂尔交叉偶联反应,生成衍生物 7â13,根据umpolung 方法,这些衍生物还可以转化为羰基化合物 14â19。