Convenient synthesis of 2,2-disubstituted-2,3-dihydro-1,4-benzodioxins from 2-substituted-2-hydroxy-2,3-dihydro-1,4-benzodioxins
                                
                                    
                                        作者:Valérie Thiéry、Gérard Coudert、Gérald Guillaumet                                    
                                    
                                        DOI:10.1016/s0040-4020(96)01140-4
                                    
                                    
                                        日期:1997.2
                                    
                                    Convenient syntheses of relatively rare 2,2-disubstituted-2,3-dihydro-1,4-benzodioxins from 2-substituted-2-hydroxy 2,3-dihydro-1,4-benzodioxins, as key synthetic intermediates, are reported. These new synthetic approaches require Lewis acid BF3-Et(2)O mediated nucleophilic substitution reaction or cyclization of suitable hydroxyphenols. (C) 1997, Elsevier Science Ltd.