Ytterbium triflate-catalyzed conjugate addition of β-ketoesters to activated 1,4-naphthoquinones

被引:36
作者
Mudiganti, Naga Venkata Sastry [1 ]
Claessens, Sven [1 ]
De Kimpe, Norbert [1 ]
机构
[1] Univ Ghent, Fac Biosci Engn, Dept Organ Chem, B-9000 Ghent, Belgium
关键词
FREE-RADICAL REACTION; CYTOTOXICITY EVALUATION; DICARBONYL COMPOUNDS; PYRIDINIUM YLIDES; QUINONES; DERIVATIVES; 2-AMINO-1,4-NAPHTHOQUINONES; ALKYLATION;
D O I
10.1016/j.tet.2008.12.021
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
An efficient procedure for the conjugate addition of various beta-ketoesters to activated 1,4-naphthoquinones using a catalytic amount of Yb(OTf)(3) was developed. The tri-, tetra-, and pentacyclic adducts were obtained in very good to excellent yield. Cyclic beta-ketoesters added smoothly to activated quinones when compared to their acyclic counterparts. (C) 2008 Elsevier Ltd. All rights reserved.
引用
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页码:1716 / 1723
页数:8
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