Enantioselective allylation of alkyl glyoxylates catalyzed by (salen)chromium(III) complexes
作者:Piotr Kwiatkowski、Wojciech Chaładaj、Janusz Jurczak
DOI:10.1016/j.tetlet.2004.05.088
日期:2004.7
The enantioselective addition of allylstannanes and allylsilanes to alkyl glyoxylates of type 1, catalyzed by chiral (salen)Cr(III) complexes 3, has been studied. We have found that the reaction proceeded smoothly for low loading (1–2 mol %) of (1R,2R)-(salen)Cr(III)BF43a or (1R,2R)-(salen)Cr(III)ClO43c, and allyltributyltin under simple, undemanding conditions, affording (R)-2-hydroxypent-4-enoic
已经研究了由手性(salen)Cr(III)配合物3催化的烯丙基锡烷和烯丙基硅烷对1型烷基乙醛酸酯的对映选择性加成。我们发现,对于(1 R,2 R)-(salen)Cr(III)BF 4 3a或(1 R,2 R)-(salen)Cr的低负载量(1-2 mol%),反应进行顺利(III)ClO 4 3c和烯丙基三丁基锡,在简单,不苛刻的条件下,以较高的收率(61–90%)和对映选择性(58–76%ee)提供了(R)-2-羟基戊-4-烯酸酯2。