Further Metalations and Functionalizations of Chloro-, Bromo- and Iodo(trifluoromethyl)pyridines
作者:Manfred Schlosser、Fabrice Cottet、Marc Marull、Florence Mongin、David Espinosa
DOI:10.1055/s-2004-829111
日期:——
In accordance with the concept of regioexhaustive functionalization, both 3-chloro-2-(trifluoromethyl)pyridine and 2-bromo-6-(trifluoromethyl)pyridine were converted each time into the three possible carboxylic acids. 2-Bromo-4-(trifluoromethyl)pyridine, 2-bromo-5-(trifluoromethyl)pyridine, 2-iodo-4-(trifluoromethyl)pyridine, and 4-iodo-2-(trifluoromethyl)pyridine were selectively deprotonated and
根据区域耗竭功能化的概念,3-氯-2-(三氟甲基)吡啶和2-溴-6-(三氟甲基)吡啶每次都转化为三种可能的羧酸。2-溴-4-(三氟甲基)吡啶、2-溴-5-(三氟甲基)吡啶、2-碘-4-(三氟甲基)吡啶和4-碘-2-(三氟甲基)吡啶被选择性去质子化并随后羧化在相应的。3个位置。最后,N-新戊酰基保护的 2-氨基-3-氯-5-(三氟甲基)吡啶在 4 位去质子化,中间体被碘和苯甲醛捕获。[关于 SciFinder (R)]