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Phosphine-catalyzed enantioselective [3+2] annulations of 2,3-butadienoates with imines
被引:120
|作者:
Jean, L
[1
]
Marinetti, A
[1
]
机构:
[1] CNRS, Inst Chim Subst Nat, UPR 2301, F-91198 Gif Sur Yvette, France
关键词:
3+2] cycloadditions;
enantioselective organocatalysis;
phosphines;
3-pyrrolines;
D O I:
10.1016/j.tetlet.2006.01.122
中图分类号:
O62 [有机化学];
学科分类号:
070303 ;
081704 ;
摘要:
The first systematic screening of chiral phosphines in the cycloaddition reaction between 2,3-butadienoates and arylimines has led to the identification of fairly efficient catalysts. 2-Aryl-3-pyrrolines have been obtained with enantiomeric excesses up to 64%. In one instance, the enantiomeric excess could be increased to 91% ee by combining the enantioselective cyclization reaction with a crystallization step. (c) 2006 Elsevier Ltd. All rights reserved.
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页码:2141 / 2145
页数:5
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