Regioselective construction of polysubstituted pyridine ring from Baylis–Hillman adducts via sequential introduction of tosylamide, Michael reaction, aldol condensation, and elimination of TsH
摘要:
Facile synthetic method of polysubstituted pyridine derivatives was developed starting from the Baylis-Hillman adducts. The reaction involved sequential introduction of tosylamide, Michael addition, aldol condensation, elimination of p-toluenesulfinic acid, and isomerization process. (c) 2005 Elsevier Ltd. All rights reserved.
Chiral Phosphine-Catalyzed Enantioselective Construction of γ-Butenolides Through Substitution of Morita−Baylis−Hillman Acetates with 2-Trimethylsilyloxy Furan
作者:Ying-Qing Jiang、Yong-Ling Shi、Min Shi
DOI:10.1021/ja802422d
日期:2008.6.1
Chiral multifunctional phosphine (R)-N-(2'-diphenylphosphanyl-[1,1']binaphthalenyl-2-yl)methanesulfonamide L2 or (R)-N-(2'-diphenylphosphanyl-[1,1']binaphthalenyl-2-yl)acetamide L3 is an efficient catalyst in the allylic substitutions of MBH acetates 1 with 2-trimethylsilyloxy furan 2 to provide gamma-butenolides 3 in good to excellent yields and enantiomeric excesses in the presence of water.
Montmorillonite K10 Clay-Microwave Assisted Isomerisation of Acetates of the Baylis-Hillman Adducts: A Facile Method of Stereoselective Synthesis of (E)-Trisubstituted Alkenes
作者:Ponnusamy Shanmugam、Paramasivan Raja Singh
DOI:10.1055/s-2001-16040
日期:——
Montmorillonite K10-microwave assisted stereoselective isomerisation of acetates of the Baylis-Hillman adducts furnished (E)-trisubstituted alkenes in high yields. A comparative study of this reaction with Mont-K10, ion-exchanged clay (Fe3+-Mont-K10) and acid treated regional natural Kaolinite clay and the efficiency of these clays in this reaction is described.
Studies on montmorillonite K10-microwave assisted isomerisation of Baylis–Hillman adduct. Synthesis of E-trisubstituted alkenes and synthetic application to lignan core structures by vinyl radical cyclization
作者:Ponnusamy Shanmugam、Paramasivan Rajasingh
DOI:10.1016/j.tet.2004.07.067
日期:2004.10
The isomerisation of acetates from the Baylis–Hillman adducts with Mont.K10 clay-microwave combination furnished E-trisubstituted alkenes in high yield. The simple Baylis–Hillman adducts with trimethyl orthoformate and unsaturated alcohols under clay catalytic condition gave densely functionalised-isomerized products under solvent free condition. Application of the propargyl derivatives thus obtained
Chiral Bifunctional Thiourea-Phosphane Organocatalysts in Asymmetric Allylic Amination of Morita-Baylis-Hillman Acetates
作者:Hong-Ping Deng、Yin Wei、Min Shi
DOI:10.1002/ejoc.201001660
日期:2011.4
A series of new chiralbifunctionalthiourea-phosphane catalysts was synthesized and successfully applied in the catalytic, asymmetricallylicamination of Morita-Baylis-Hillman (MBH) acetates derived from the methyl vinyl ketone (MVK) or ethyl vinyl ketone (EVK) system, with phthalimide, affording the amination products in up to over 99 % yield and 90 % ee for a wide range of substrates derived from
FeCl<sub>3</sub>and Yb(OTf)<sub>3</sub>Mediated Conversion of Acetates of the Baylis–Hillman Adducts into (Z) and (E) Trisubstituted Alkenes
作者:Palakodety Radha Krishna、V. Kannan、G. V. M. Sharma
DOI:10.1081/scc-120027238
日期:2004.12.31
Abstract Anhydrous FeCl3 and Yb(OTf)3 are utilised as new reagents for the stereoselective isomerisation of acetates of the Baylis–Hillmanadducts to both (Z) and (E) trisubstitutedalkenes respectively.