The Proline-Catalyzed Double Mannich Reaction of Acetaldehyde with<i>N</i>-Boc Imines
作者:Carley Chandler、Patrizia Galzerano、Anna Michrowska、Benjamin List
DOI:10.1002/anie.200806049
日期:2009.3.2
Double‐cross: Proline catalyzes the double Mannich reaction of acetaldehyde with N‐Boc imines in excellent yields (up to 99 %; Boc=tert‐butoxycarbonyl) and close to perfect diastereo‐ and enantioselectivities. Depending on the choice of catalysts, both the chiral, pseudo‐C2‐symmetric diastereomer and the corresponding meso compound can be prepared. Cross double Mannich reactions of acetaldehyde with
二次杂交:脯氨酸催化乙醛与N -Boc亚胺的双重曼尼希反应,产率高(高达99%; Boc =叔丁氧羰基),非对映选择性和对映选择性接近。根据催化剂的选择,可以制备手性,伪C 2对称非对映异构体和相应的内消旋化合物。还证明了乙醛与两种不同的亚胺的交叉双曼尼希反应。