期刊
TETRAHEDRON
卷 63, 期 48, 页码 11920-11927出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2007.09.022
关键词
[3+2] cyclisations; asymmetric organocatalysis; nitrogen heterocycles; chiral phosphines; phosphepines
The use of chiral, binaphthyl-based phosphepines as catalysts improves previous results for the enantioselective [3+2] cyclisation reactions between allenic esters and N-tosylimines, both in terms of conversion rate and enantioselectivity. Pyrrolines bearing 1-naphthyl, phenyl, o-tolyl and p-MeO-phenyl substituents on the stereogenic alpha-carbon have been obtained with enantiomeric excesses up to 64-80%. (c) 2007 Elsevier Ltd. All rights reserved.
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