Direct Organocatalytic Asymmetric Approach to Baylis-Hillman-Type Products Through a Push-Pull Dienamine Platform
作者:Dhevalapally B. Ramachary、Kinthada Ramakumar
DOI:10.1002/ejoc.201100075
日期:2011.5
A general process for the asymmetricsynthesis of highly substituted 3-alkyl-Hagemann's esters was achieved for the first time through organocatalytic Michael or Baylis―Hillman-type (BH-type) reaction of Hagemann's esters with β-nitrostyrenes in the presence of a catalytic amount of L-(3,5-Me 2 ) 2 DPP/ thiourea. We have discovered, for the first time, the chiral BH-type products from Hagemann's esters
Organocatalytic diastereoselective synthesis of chiral decalines through the domino Claisen–Schmidt/Henry reaction
作者:Adluri B. Shashank、Dhevalapally B. Ramachary
DOI:10.1039/c5ob00562k
日期:——
General and operative domino Claisen–Schmidt/Henry (CS/H) reaction has been revealed to obtain highly substituted chiral decalines in good yields with excellent ees and des by using push–pull enamine catalysis.
Sequential One-Pot Combination of Multireactions through Multicatalysis: A General Approach to Rapid Assembly of Functionalized Push−Pull Olefins, Phenols, and 2-Methyl-2<i>H</i>-chromenes
作者:Dhevalapally B. Ramachary、Kinthada Ramakumar、Adluri Bharanishashank、Vidadala V. Narayana
DOI:10.1021/cc100104k
日期:2010.11.8
the sequential cascade one-pot synthesis of library of highly substituted push-pull olefins, phenols and 2-methyl-2H-chromenes was reported through multicatalysis cascade (MCC) reactions. Direct sequential one-pot combination of amine- or amino acid-catalyzed cascade Knoevenagel/Michael/aldol condensation/decarboxylation with other reactions like amine- or amino acid-catalyzed cascade Claisen-Schmi
Cyclization of 1,3-disubstituted 2-(3-butenyl)-2-cyclohexen-1-ols
作者:E.-J. Brunke、F.-J. Hammerschmidt、H. Struwe
DOI:10.1016/s0040-4020(01)97681-1
日期:1981.1
The cationic cyclization of cyclohexenols 8a-c gave mixtures of the octalinols 9a-c and 10a-c with 9a-c as main products. By cyclization of the isomeric educts 13a-c, the same products were formed in different proportions.