The first synthesis of β-phenylchalcogeno-α,β-unsaturated esters via hydrochalcogenation of acetylenes using microwave and solvent-free conditions
                                
                                    
                                        作者:Gelson Perin、Raquel G. Jacob、Francisco de Azambuja、Giancarlo V. Botteselle、Geonir M. Siqueira、Rogério A. Freitag、Eder J. Lenardão                                    
                                    
                                        DOI:10.1016/j.tetlet.2005.01.060
                                    
                                    
                                        日期:2005.3
                                    
                                    A simple, clean, and efficient solvent-free protocol was developed for hydrochalcogenation of methyl propiolate derivatives with phenylchalcogenolate anion generated in situ from the respective diphenyl dichalcogenide (S, Se, Te) using alumina supported sodium borohydride. This efficient and improved method is general and furnishes the (Z)-beta-phenylchalcogeno-alpha,beta-unsaturated esters in yields and with selectivity comparable to those using organic solvent and inert atmosphere. The use of MW irradiation facilitates the procedure and accelerates the reaction. (C) 2005 Elsevier Ltd. All rights reserved.