Asymmetric [2,3]-Sigmatropic Rearrangement of Allylic Ammonium Ylides
作者:Jan Blid、Olaf Panknin、Peter Somfai
DOI:10.1021/ja0510562
日期:2005.7.1
An asymmetric Lewis acid-mediated [2,3]-sigmatropicrearrangement of allylic amines has been developed, affording the corresponding homoallylic amines in good yield and excellent enantioselectivities. The rearrangement proceeds by complexation of the chiral Lewis acid to the amine followed by deprotonation and rearrangement.
Lewis acid mediated [2,3]-sigmatropic rearrangement of allylic ammonium ylides
作者:Jan Blid、Peter Somfai
DOI:10.1016/s0040-4039(03)00510-0
日期:2003.4
An investigation of the Lewis acid mediated [2,3]-sigmatropicrearrangement of allylic ammonium ylides has been conducted by employing various bases and boron Lewis acids. Using BBr3 together with the phosphazene base 6, various allylic amines could be rearranged in good yields with low to excellent diastereoselectivity.