Highly Enantioselective Carbonyl–Ene Reactions of 2,3‐Diketoesters: Efficient and Atom‐Economical Process to Functionalized Chiral α‐Hydroxy‐β‐Ketoesters
作者:Phong M. Truong、Peter Y. Zavalij、Michael P. Doyle
DOI:10.1002/anie.201402233
日期:2014.6.16
Carbonyl–ene reactions of 2,3‐diketoesters catalyzed by [Cu(S,S)‐tBu‐box}](SbF6)2 [box=bis(oxazoline)] generate chiral α‐functionalized α‐hydroxy‐β‐ketoesters in up to 94 % yield and 97 % ee. The 2,3‐diketoesters are conveniently accessed from the corresponding α‐diazo‐β‐ketoester, and a catalyst loading as low as 1.0 mol % can be achieved.
[Cu (S,S)-t Bu-box}](SbF 6)2 [box = bis(oxazoline)]催化的2,3-二酮酸酯的羰基-烯反应生成手性α-官能化的α-羟基-β酮酯的产率高达94%,ee高达97% 。从相应的α-重氮-β-酮酸酯可方便地获得2,3-二酮酸酯,催化剂的负载量可低至1.0 mol%。