Reaction of Functionalized Anilines with Dimethyl Carbonate over NaY Faujasite. 3. Chemoselectivity toward Mono-<i>N</i>-methylation
作者:Maurizio Selva、Pietro Tundo、Alvise Perosa
DOI:10.1021/jo034548a
日期:2003.9.1
derivatives [XC(6)H(4)NHMe, X = o-, m-, and p-OH; o- and p-CH(2)OH; o- and p-CO(2)H; o- and p-CONH(2)] are obtained with selectivity up to 99% and isolated yields of 74-99%. DMC, which usually promotes methylations only at T > 120 degrees C, is activated by the zeolite catalyst and it reacts with compounds 1, 2, and 4, at 90 degrees C. Aminobenzoic acids (3) require a higher reaction temperature (> or =130
在NaY八面沸石的存在下,碳酸二甲酯(MeOCO(2)Me,DMC)是功能化苯胺的高度化学选择性甲基化剂,例如氨基酚(1),氨基苄醇(2),氨基苯甲酸(3)和氨基苯甲酰胺(4) )。该反应以排他性地形成N-甲基苯胺而没有任何同时的O-甲基化或N- / O-甲氧基羰基化副过程进行。特别地,仅单-N-甲基衍生物[XC(6)H(4)NHMe,X = o-,m-和对-OH;邻-和对-CH(2)OH; o-和p-CO(2)H; o-和p-CONH(2)]的选择性高达99%,分离产率为74-99%。DMC通常仅在T> 120摄氏度时才促进甲基化,它会被沸石催化剂活化,并在90摄氏度时与化合物1、2和4反应。氨基苯甲酸(3)需要更高的反应温度(>或= 130摄氏度)。