Indium trichloride in an acetonitrile-water mixture chemoselectively cleaved the isopropylidene acetals of various 1,3-dioxolanyl-substituted 1,2-oxazines as well as carbohydrate derivatives. Deprotection of acetonides can be achieved in substrates susceptible for acid-induced cyclizations. Most importantly, enol ether moieties are not attacked and the presence of glycosidic linkages or acid-sensitive protecting groups such as tert-butyldimethylsilyl, 2-(trimethylsilyl)ethyl, or tert-butoxycarbonyl is also tolerated.
三氯化铟在
乙腈-
水混合物中能
化学选择性地裂解各种 1,3- 二
氧戊环取代的 1,2- 氧嗪的异亚丙基
乙醛以及
碳水化合物衍
生物。在易受酸诱导环化作用影响的底物中,可以实现
丙酮的脱保护。最重要的是,烯醇醚分子不会受到侵蚀,而且还能承受糖苷键或对酸敏感的保护基团(如叔丁基二甲基
硅基、2-(三甲基
硅基)乙基或叔丁氧基羰基)的存在。