Highly enantioselective aldol reaction of acetaldehyde and isatins only with 4-hydroxydiarylprolinol as catalyst: concise stereoselective synthesis of (R)-convolutamydines B and E, (−)-donaxaridine and (R)-chimonamidine
A highly enantioselectivealdolreaction of acetaldehyde and a wide scope of isatins has been presented only using readily available 4-hydroxydiarylprolinol as catalyst, affording various desired 3-substituted 3-hydroxyindolin-2-one adducts with moderate to high yield (up to 95%) and good enantioselectivities (up to 98% ee). This method not only represents an example of concise stereoselective synthesis
Crossed‐aldol reaction: The synthesis of (R)‐convolutamydine E has been achieved by the crossed‐aldol reaction of acetaldehyde with 4,6‐dibromoisatin (1: X = Y = Br) by using a bifunctional organocatalyst. This strategy allows the enantioselectivesynthesis of (R)‐convolutamydine E derivatives and convolutamydine B.
交叉醛醇缩合反应:使用双功能有机催化剂,通过乙醛与4,6-二溴异丁香苷的交叉醇醛缩合反应(1:X = Y = Br)合成了(R)-卷积环糊精E。这种策略允许对映体选择性合成(R)-convolutamydine E衍生物和convolutamydine B.
SIMPLE ORGANIC MOLECULES AS CATALYSTS FOR PRACTICAL AND EFFICIENT ENANTIOSELECTIVE SYNTHESIS OF AMINES AND ALCOHOLS
申请人:Trustees of Boston College
公开号:US20150057451A1
公开(公告)日:2015-02-26
The present invention provides organic molecules and methods thereof for reactions between organoboron reagents and double bonds, such as imines or carbonyls, to stereoselectively provide chiral products including amines and alcohols, entities useful for the preparation of biologically active molecules.