The [2,3]-Wittig rearrangement of an enantiomerically defined α-propargyloxy stannane with butyllithium is shown to proceed with complete inversion of configuration at the Li-bearing terminus. The periselectivity ([2,3]- vs. [1,2]-) of the rearrangement depends markedly upon the nature of substituents on the acetylenic group.
对映体定义为δ-
丙炔氧基的
锡烷与丁基
锂的[2,3]-维蒂希重排反应表明,在含
锂末端的构型完全反转。重排的全选择性([2,3]- 与 [1,2]-)明显取决于
乙炔基上取代基的性质。