Nucleophilic displacement reactions of the methanesulfonates of the 1-O-benzoyl-1,2-, -1,3-, and -1,4-glycols
作者:Seiichi Takano、Michiyasu Hirama、Kazuhiko Seya、Kunio Ogasawara
DOI:10.1016/s0040-4039(00)88309-4
日期:——
Nucleophilic displacement reactions of the methanesulfonates (a–c) of the 1-O-benzoyl-1,2-, -1,3-, and -1,4-glycols (a–c) with potassium acetate in boiling acetic anhydride have been examined. Both benzoyloxy-group participation pathway (path ) and SN2 displacement pathway (path ) have been involved in the 1,2-(a)- and 1,3-(b)-substrates to give a mixture of the primary (a,b) and the secondary (a,b)
1- O-苯甲酰基-1,2-,-1,3-和-1,4-乙二醇(a-c)的甲磺酸盐(a -c)与乙酸钾在沸腾乙酸酐中的亲核取代反应具有经过检查。1,2-(a)-和1,3-(b)-底物均涉及苯甲酰氧基基团参与途径(path )和S N 2置换途径(path ),从而形成主要(a ,b)和具有完全手性反转的仲(a,b)乙酸盐。另一方面,在1,4-底物(c)中仅涉及S N 2置换途径(路径),以得到具有手性反转的仲乙酸酯(c)。