Catalytic asymmetric allylations of achiral and chiral aldehydes via BINOL–Zr complex
作者:Michio Kurosu、Miguel Lorca
DOI:10.1016/s0040-4039(02)00139-9
日期:2002.3
The complex generated from BINOL, Zr(OtBu)4, and 4 Å MS in toluene–pivalonitrile is very effective for catalytic asymmetric allylation of aldehydes using allyltributyltin. The reactions of achiral aldehyde under these conditions are completed within 3 h using 10–20 mol% of the complex at −20°C. The ees of homoallylic alcohols can be enhanced up to 98% via the tandem asymmetric allylation–Oppenauer
由甲苯,新戊腈中的BINOL,Zr(O t Bu)4和4ÅMS生成的络合物对于使用烯丙基三丁基锡催化醛的催化不对称烯丙基化非常有效。在20°C下,使用10–20 mol%的配合物,可在3小时内完成这些条件下的非手性醛的反应。通过串联不对称烯丙基化-Oppenauer氧化可将均丙醇的ee提高至98%。对β-烷氧基醛的这些条件的范围和局限性进行了广泛的研究。