The first catalytic enantioselective β-hydroxylation of α,β-unsaturatedaldehydes is presented. Using commercially available (E)-benzaldehyde oxime in the presence of 2-[bis(3,5-bis-trifluoromethyl-phenyl)trimethyl-silanyloxymethyl]pyrrolidine as organocatalyst, the corresponding chiral carbonyl β-oxime ethers are obtained in high yields and with excellent enantioselectivities. These optically active
An efficient and enantioselective Michael addition of aromatic oximes to<i>α</i>,<i>β</i>-unsaturated aldehydes promoted by a chiral diamine catalyst derived from<i>α</i>,<i>α</i>-diphenyl prolinol
作者:Feng Chen、Hong-Xia Ren、Yu Yang、Shan-Ping Ji、Zheng-Bing Zhang、Fang Tian、Lin Peng、Li-Xin Wang
DOI:10.1002/chir.22699
日期:2017.7
Chiral diamine catalysts 11a–e derived fromα,α‐diphenyl prolinol were prepared and successfully applied to the Michael addition of aromatic oximes to α,β‐unsaturated aldehydes in mediocre to good yields (up to 78%) and good to high enantioselectivities (up to 93% ee).