作者:José Luis García Ruano、José Aleman、Albert Padwa
DOI:10.1021/ol0495725
日期:2004.5.1
A new type of vinylogous tin-Pummerer rearrangement reaction was observed when benzyl tin derivatives containing a sulfinyl group at the ortho position were allowed to react with acyl chlorides or TFAA. The reaction is thought to proceed by nucleophilic attack of the leaving carboxylate at the gamma-position of the conjugated thionium ion. The enantioselectivity (ee) of the reaction can reach values
当在邻位含有亚磺酰基的苄基锡衍生物与酰氯或TFAA反应时,观察到一种新型的乙烯基锡-Pummerer重排反应。该反应被认为是通过在共轭硫鎓离子的γ-位上离开的羧酸盐的亲核攻击而进行的。反应的对映选择性(ee)可以达到高达98%的值。观察到的立体选择性与溶剂的性质,使用的温度以及迁移的羧酸根阴离子的稳定性有关。[反应-见文字]