Catalyzed Cyclizations Leading to Enrichment of Functionality and Chirality. A General Approach to Dibenzocyclooctadiene Lignans from α,ω-Diynes
                                
                                    
                                        作者:Ramakrishna Reddy Singidi、T. V. RajanBabu                                    
                                    
                                        DOI:10.1021/ol8013792
                                    
                                    
                                        日期:2008.8.7
                                    
                                    The [B-Sn]-mediated cyclization of alpha,omega-diynes results in not only an increase in the functionalizable groups (incorporated as highly versatile vinyl-B and vinyl-Sn groups) but also an increase in new serviceable stereochemical elements. The alkylidene functionalities at C-7 and C-8 offer unprecedented opportunities for the synthesis of highly functionalized dibenzocyclooctadienes. Examples of interiotherins and gomisins are provided.