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
Montmorillonite K10 Clay Catalyzed Mild, Clean, Solvent Free One-pot Protection-Isomerisation of the Baylis–Hillman Adducts with Alcohols
作者:Ponnusamy Shanmugam、Paramasivan Rajasingh
DOI:10.1246/cl.2002.1212
日期:2002.12
The montmorillonite K10 clay catalyzed mild, clean, and solvent free one-pot reactions of the Baylis–Hillman adducts with a number of alcohols undergo secondary alcohol protection followed by a facile 1,3-sigmatropic shift isomerised products in excellent yield. The isomerised products with propargyl alcohol are highly functionalized and useful for lignan natural product synthesis.
Titanocene(III) Chloride Mediated Stereoselective Synthesis of Trisubstituted Tetrahydrofurans and a Spirolactone by Tandem Radical Reactions
作者:Shirshendu Mukherjee、Rajdip Roy、Subhas Chandra Roy
DOI:10.1002/ejoc.201400097
日期:2014.5
The titanocene(III) chloride (Cp2TiCl) mediated stereoselectivesynthesis of highly substituted tetrahydrofurans has been achieved by a reaction that proceeds through a tandem radical cyclization reaction between a Baylis–Hillman adduct and an activated bromo/iodo compound. The reaction of an epoxide with the Baylis–Hillman adduct furnished a spirolactone through a radical cyclization followed by an
Regio- and stereoselective synthesis of methyl 5-methylenetetrahydropyran-3-carboxylates from Baylis–Hillman adducts via allyltributylstannane-mediated radical cyclization
作者:Saravanan Gowrisankar、Ka Young Lee、Taek Hyeon Kim、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2006.05.186
日期:2006.8
Two types of regioisomeric methyl 5-methylenetetrahydropyran-3-carboxylate derivatives 3a–c and 6a–c were synthesized stereoselectively starting from the Baylis–Hillman adducts via the allyltributylstannane-mediated vinyl radical cyclization as the key step.