Chiral bifunctional thiourea-catalyzed enantioselective aldol reaction of trifluoroacetaldehyde hemiacetal with aromatic ketones
作者:Jing Nie、Xiao-Juan Li、Dong-Hua Zheng、Fa-Guang Zhang、Shumin Cui、Jun-An Ma
DOI:10.1016/j.jfluchem.2011.04.019
日期:2011.7
the direct aldol condensation of trifluoroacetaldehyde methyl hemiacetal with aromatic ketones proceeds to produce (R)-β-hydroxy β-trifluoroalkyl ketones in low to moderate yields with good enantioselectivities.
<i>C</i><sub>2</sub>-Symmetric Chiral Bisoxazolines as Hydrogen-Bond-Acceptor Catalysts in Enantioselective Aldol Reaction of β-Carbonyl Acids with Trifluoroacetaldehyde Hemiacetals
作者:Zhen-Yan Yang、Jun-Liang Zeng、Nan Ren、Wei Meng、Jing Nie、Jun-An Ma
DOI:10.1021/acs.orglett.6b03256
日期:2016.12.16
C2-symmetric chiral bisoxazoline is demonstrated to use hydrogen bonding to catalyze an important family of aldolreactions of trifluoroacetaldehyde hemiacetals with various β-carbonyl acids. This reaction is highly enantioselective, delivering chiral nonracemic trifluoromethylated alcohols with excellent optical purity and good isolated yields. This concept of relaying chiral information via a chiral hydrogen-bond