Chiral 1,3-oxazolidines are readily prepared from methyl ketones and chiral norephedrine. Formation of stannous azaenolates from the oxazolidines and reaction with aldehydes followed by removal of the chiral auxiliary lead to the aldol products in high level of enantiomeric purity.
Kinetic Resolution of β-Hydroxy Carbonyl Compounds via Enantioselective Dehydration Using a Cation-Binding Catalyst: Facile Access to Enantiopure Chiral Aldols
作者:Sushovan Paladhi、In-Soo Hwang、Eun Jeong Yoo、Do Hyun Ryu、Choong Eui Song
DOI:10.1021/acs.orglett.8b00547
日期:2018.4.6
β-hydroxy carbonyl (aldol) compounds through enantioselective dehydration process was developed using a cation-binding Song’s oligoethylene glycol (oligoEG) catalyst with potassium fluoride (KF) as base. A wide range of racemic aldols was resolved with extremely high selectivity factors (s = up to 2393) under mild reaction conditions. This protocol is easily scalable. It provides an alternative approach for
A chiral hydrobenzoin/Ca complex catalyzes the reaction of acetophenone and aliphatic aldehydes to give the corresponding aldol products in up to 91% ee.
手性氢安息香/ Ca复合物催化苯乙酮与脂族醛的反应,得到相应的羟醛产物,其ee含量高达91%。
Enantioselective aldol reaction mediated by chiral lithium amide bases
作者:Masami Muraoka、Hisashi Kawasaki、Kenji Koga*
DOI:10.1016/s0040-4039(00)80089-1
日期:1988.1
Highly enantioselective aldol reaction mediated by chiral lithium amide bases was achieved between some methylketones and aldehydes
在一些甲基酮和醛之间实现了由手性锂酰胺碱介导的高度对映选择性羟醛反应
A Direct Catalytic Enantioselective Aldol Reaction via a Novel Catalyst Design