catalytic asymmetric Henry reaction has been developed with use of a sulfonyldiamine−CuCl complex as a catalyst. A series of new binaphthyl-containing sulfonyldiamine ligands (2a−h) were readily synthesized in two steps starting from commercially available chiral 1,2-diamines. The (R,R)-diamine-(R)-binaphthyl ligand (2d)−CuCl complex smoothly catalyzed the enantioselective Henry reaction with the assistance
Enantioselective Michael addition of ketones to maleimides catalyzed by bifunctional monosulfonyl DPEN salt
作者:Feng Yu、Xiaomin Sun、Zhichao Jin、Shigang Wen、Xinmiao Liang、Jinxing Ye
DOI:10.1039/c0cc00774a
日期:——
An unprecedented enantioselective Michaeladdition of various ketones to maleimidescatalyzed by a simple bifunctional primary amine, monosulfonyl DPEN salt, is reported and provides the desired adducts in good to excellent yields (up to 99%) with excellent enantioselectivities (up to 99%).
Reversal of Enantioselectivity in the Copper-Aminophenol Sulfonamide Catalyzed Alkynylation of Isatins by Slightly Tuning the Ligand Structure and Basic Additives
been developed for the first Cu(I) catalyzed enantiodivergent alkynylation of isatins. Dramatic reversal of enantioselectivity was accomplished by slightly tuning the substituted benzenesulfonamide and achiral basic additives. A wide range of both terminal alkynes and isatins are tolerated by this new catalyst system with up to 99% yield and 97% ee.
OPTICALLY ACTIVE CYCLIC ALCOHOL COMPOUND AND METHOD FOR PREPARING THE SAME
申请人:OKAMOTO Masaki
公开号:US20110196157A1
公开(公告)日:2011-08-11
The present invention relates to a method for preparing an optically active cyclic alcohol compound represented by general formula [I]:
[wherein R represents a hydrogen atom or a protecting group for amino group, and * represents an asymmetric carbon atom.]
which comprises a step of subjecting a cyclic ketone compound represented by general formula [II]:
[wherein R has the same meaning as defined above.]
to asymmetric reduction (A) in the presence of an optically active oxazaborolidine compound and a boron hydride compound, or (B) in the presence of an asymmetric transition metal complex obtained from a transition metal compound and an asymmetric ligand and a hydrogen donor, and relates to said compound.
Optically Active Cyclic Alcohol Compound And Method For Preparing The Same
申请人:Okamoto Masaki
公开号:US20130237708A1
公开(公告)日:2013-09-12
The present invention relates to a method for preparing an optically active cyclic alcohol compound represented by general formula [I]:
[wherein R represents a hydrogen atom or a protecting group for amino group, and * represents an asymmetric carbon atom.]
which comprises a step of subjecting a cyclic ketone compound represented by general formula [II]:
[wherein R has the same meaning as defined above.]
to asymmetric reduction (A) in the presence of an optically active oxazaborolidine compound and a boron hydride compound, or (B) in the presence of an asymmetric transition metal complex obtained from a transition metal compound and an asymmetric ligand and a hydrogen donor, and relates to said compound.