作者:Vladislav Kotek、Naděžda Chudíková、Tomáš Tobrman、Dalimil Dvořák                                    
                                    
                                        DOI:10.1021/ol1025525
                                    
                                    
                                        日期:2010.12.17
                                    
                                    A simple and efficient protocol for the preparation of 7-substituted purines is described. 6- and 2,6-Dihalopurines were N-9-tritylated and then transformed to 7,8-dihydropurines by DIBAL-H. Subsequent N-7-alkylation followed by N-9-trityl deprotection with trifluoroacetic acid was accompanied by spontaneous reoxidation, which led to the 7-substituted purines at 55-88% overall isolated yields.