名称:
                                Synthesis of pyrido and pyrazinodithienodipyrimidine-4,8(3H,9H)-dione derivatives by the aza-Wittig methodology
                             
                            
                                摘要:
                                A one-pot synthesis of the hitherto unreported pyrido[5",6":4,5;3"2":4',5']dithieno[3,2-d:3',2'-d]dipyrimidine-4,8(3H,9H)-dione 6a-o and pyrazino[5",6":4,5;3"2":4',5']dithieno[3,2-d:3',2'-d]dipyrimidine-4,8(3H,9H)-dione 6p-y pentaheterocyclic systems, based on the tandem aza-Wittig heterocumulene-mediated annulation strategy is described. (C) 2003 Elsevier Ltd. All rights reserved.