Enantioselective transformation of alpha, beta-unsaturated aldehydes using chiral organic catalysts
申请人:——
公开号:US20030109718A1
公开(公告)日:2003-06-12
Nonmetallic organic catalysts are provided that facilitate the enantioselective reaction of &agr;,&bgr;-unsaturated aldehydes. The catalysts are chiral imidazolidinone compounds having the structure of formula (IIA) or (IIB)
1
or are acid addition salts thereof, wherein, in one preferred embodiment, R
1
is C
1
-C
6
alkyl, R
2
is tri(C
1
-C
6
alkyl)-substituted methyl, R
3
and R
4
are hydrogen, and R
5
is phenyl optionally substituted with 1 or 2 substituents selected from the group consisting of halo, hydroxyl, and C
1
-C
6
alkyl. The chiral imidazolidinones are useful in catalyzing a wide variety of reactions, including cycloaddition reactions, Friedel-Crafts alkylation reactions, and Michael additions.
提供了非金属有机催化剂,促进α,β-不饱和醛的对映选择性反应。该催化剂是手性咪唑啉酮化合物,具有式(IIA)或(IIB)1的结构,或其酸加成盐,其中,在一种优选实施例中,R1为C1-C6烷基,R2为三(C1-C6烷基)取代的甲基,R3和R4为氢,R5为苯基,可选择地取代1或2个来自卤素、羟基和C1-C6烷基的取代基。手性咪唑啉酮在催化各种反应方面有用,包括环加成反应、Friedel-Crafts烷基化反应和Michael加成反应。