Rational Design of Highly Diastereoselective, Organic Base-Catalyzed, Room-Temperature Michael Addition Reactions<sup>1</sup>
作者:Vadim A. Soloshonok、Chaozhong Cai、Victor J. Hruby、Luc Van Meervelt、Takashi Yamazaki
DOI:10.1021/jo0008791
日期:2000.10.1
homogeneity and high reactivity. The corresponding Michael addition reactions were found to proceed at room temperature in the presence of catalytic amounts of DBU to afford quantitatively the addition products with virtually complete diastereoselectivity. Acidic decomposition of the products followed by treatment of the reaction mixture with NH4OH gave rise to the diastereomerically pure 3-substituted
Improvement of TADDOLate−TiCl<sub>2</sub>-Catalyzed 1,3-Dipolar Nitrone Cycloaddition Reactions by Substitution of the Oxazolidinone Auxiliary of the Alkene with Succinimide
作者:Kim B. Jensen、Kurt V. Gothelf、Rita G. Hazell、Karl Anker Jørgensen
DOI:10.1021/jo962214y
日期:1997.4.1
tested as catalysts for the 1,3-dipolarcycloaddition reactions, and the most successful catalyst was applied (5 mol %) in a series of reactions between two different alkenoylsuccinimides and three different nitrones. The crude products containing an N-acylsuccinimide moiety were converted directly into the corresponding carboxamides upon treatment with hydrazine. The 1,3-dipolarcycloaddition reactions
Yb(OTf)(3) (ytterbium trifluoromethanesulfonate)-catalyzed diastereoselective 1,3-dipolar cycloaddition of a nitrone with alpha,beta-unsaturated carbonyl compounds was studied. While endo-cycloadduct was obtained from the reaction of C, N-diphenylnitrone with N-crotonoyl-oxazolidinone or N-crotonyl-2-pyrrolidinone in toluene, exo-adduct was predominant in acetonitrile. The enones carrying imidazolidinone or succinimide ring reacted with the nitrone to give the exo-adducts primarily in both solvents. (C) 1998 Elsevier Science Ltd. All rights reserved.
Enantioselective synthesis of enol lactones from tandem Michael addition/lactonization catalyzed by a chiral squaramide catalyst
作者:Bo-Liang Zhao、Da-Ming Du
DOI:10.1016/j.tetasy.2014.01.005
日期:2014.2
Chiral squaramide-catalysed one-pot enantioselective sulfa-Michael addition/thioesterification of thiols with α,β-unsaturated N-acylated succinimides
作者:Bo-Liang Zhao、Da-Ming Du
DOI:10.1039/c3ob42137f
日期:——
A novel highly enantioselective one-pot dithiolation through sulfa-Michael addition/thioesterification of thiols with α,β-unsaturatedN-acylated succinimides catalysed by squaramide has been developed. This organocatalysed reaction proceeded well in high to excellent yields (up to >99%) to afford useful bioactive β-sulfated thioester derivatives with high enantioselectivities (up to 96% ee).