申请人:Brigham Young University
公开号:US05134238A1
公开(公告)日:1992-07-28
Disclosed herein is a class of chiral copper-amine complexes of the formula R(L*) CuLi in which L* is selected from: ##STR1## In this formula, R is a transferable ligand, which can be alkyl, aryl or aralkyl. M is a metal ion such as Li, Na, K, Cs, Rb, Be, Mg and other metal ions from the first two columns of the periodic table. R.sub.1 is straight chain alkyl, R.sub.2 is aryl or substituted aryl and R.sub.3 and R.sub.4 form a heterocyclic ring or a substituted heterocyclic ring with 4 to 8 members including oxygen and sulfur. Such complexes react with .alpha.,.beta.-unsaturated ketones, aldehydes, esters and other carbonyl containing compounds such that R is transferred to the 3 position enantioselectively as shown below. ##STR2## Such complexes react with .alpha.,.beta.-unsaturated ketones in the presence of trialkysilyl halides to give silyl enol ether in which R is substituted in the 3 position as shown below. ##STR3##
本文披露了一类手性铜胺配合物,其化学式为 R(L*) CuLi,其中 L* 选自:##STR1## 在该式中,R 是可转移的配体,可以是烷基、芳基或芳基烷基。M 是金属离子,如 Li、Na、K、Cs、Rb、Be、Mg 和周期表前两列中的其他金属离子。R.sub.1 是直链烷基,R.sub.2 是芳基或取代芳基,R.sub.3 和 R.sub.4 形成含氧和硫的 4 到 8 个成员的杂环或取代杂环。这类配合物与α,β-不饱和酮、醛、酯和其他含羰基化合物发生反应,使 R 在对映选择性地转移到 3 位,如下所示。##STR2## 这类配合物与α,β-不饱和酮在三烷基硅基卤化物存在下反应,生成硅烯醚,其中 R 在 3 位被取代,如下所示。##STR3##