<i>P</i>-Chirogenic Binaphthyl-Substituted Monophosphines: Synthesis and Use in Enolate Vinylation/Arylation Reactions
作者:Takayuki Hamada、Stephen L. Buchwald
DOI:10.1021/ol025563p
日期:2002.3.1
[reaction: see text] New phosphine ligands possessing both axial chirality and a chirogenic phosphorus center were prepared from (R)-2-bromo-2'-N,N-(dimethylamino)-1,1'-binaphthyl (1) via a simple Li-halogen exchange protocol. The asymmetric vinylation of a ketone enolate with (R,R(P))-2-(tert-butylphenylphosphino)-2'-N,N-(dimethylamino)-1,1'-binaphthyl (2a) afforded the coupling product with good
[反应:见正文]由(R)-2-溴-2'-N,N-(二甲基氨基)-1,1'-联萘(1)制备具有轴向手性和生色性磷中心的新膦配体一个简单的锂卤素交换协议。酮烯醇与(R,R(P))-2-(叔丁基苯基膦基)-2'-N,N-(二甲基氨基)-1,1'-联萘基(2a)的不对称乙烯基化得到偶联产物对映体过量。