silica chloride, an eco-friendly heterogeneous catalyst, silica chloride–arenes, and silica chloride–saturated and unsaturatedalcohols as reagent systems are reported. These reactions furnished highly functionalized isomerized Baylis–Hillman derivatives in good yield. The efficiency and necessity of silica chloridecatalyst was compared with thionyl chloride. A plausible mechanism of the reaction is proposed
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
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.