Logistic flexibility in the preparation of isomeric halopyridinecarboxylic acids
作者:Fabrice Cottet、Manfred Schlosser
DOI:10.1016/j.tet.2004.09.106
日期:2004.12
5-chloro-2-(trifluoromethyl)pyridine in only two of the corresponding acids (6 and 7) and to make the third one (8) from 3-bromo-5-chloro-2-(trifluoromethyl)pyridine as an alternative starting material. All modelsubstrates for functionalization were readily accessible from the correspondingly substituted chloroiodopyridine through heavy halogen displacement by in situ generated (trifluoromethyl)copper