Regioselective halogen-metalexchangereactions using isopropylmagnesium chloride were carried out on 3-substituted 1,2-dibromo arenes. Eleven examples are given.
Halogen – metal exchange of 3-substituted 1,2-dibromoarenes: the use of long-rangeJCH coupling constants to determine regiochemistry
作者:Lisa DiMichele、Karsten Menzel、Paul Mills、Doug Frantz、Todd Nelson
DOI:10.1002/mrc.1891
日期:2006.11
Regioselective halogen/metalexchange reactions were carried out on a series of 3‐substituted‐ 1,2‐dibromoarenes. Product mixtures were quenched with CO2 to form the corresponding benzoic acid analogs to facilitate HPLC and NMR analysis. Substitution at the 3‐position could readily be assigned on the basis of 2D HMBC long‐range correlations, while assignment at the 2‐position was not as straightforward