Direct chlorination of alcohols with chlorodimethylsilane catalyzed by a gallium trichloride/tartrate system under neutral conditions
作者:Makoto Yasuda、Kenji Shimizu、Satoshi Yamasaki、Akio Baba
DOI:10.1039/b804589e
日期:——
amount of GaCl(3)/diethyl tartrate to give the corresponding organic chlorides 3. In the catalytic cycle, the reaction of diethyl tartrate 4a with HSiMe(2)Cl 2 gives the chlorosilyl ether 5 with generation of H(2). Alcohol-exchange between the formed chlorosilyl ether 5 and the substrate alcohol 1 affords alkoxychlorosilane 6, which reacts with catalytic GaCl(3) to give the chlorinated product 3. The
在催化量的GaCl(3)/酒石酸二乙酯的存在下,仲醇1与氯二甲基硅烷(HSiMe(2)Cl)的反应进行,得到相应的有机氯化物3。在催化循环中,酒石酸二乙酯4a的反应用HSiMe(2)Cl 2生成氯甲硅烷基醚5并生成H(2)。在形成的氯甲硅烷基醚5和底物醇1之间进行醇交换,得到烷氧基氯硅烷6,它与催化的GaCl(3)反应生成氯化产物3。GaCl(3)的中等路易斯酸度有助于氯化。由于对氧官能团的亲和力过强,因此强路易斯酸未产生产物。尽管即使在没有酒石酸二乙酯的情况下,叔醇也可以通过该系统进行氯化,