Efficient Regioselective Preparationof Monobromo and Bromoiodo Hydroxy Pyridines from Dibromoderivativesvia Bromine-Lithium Exchange
作者:Mª Ascensión Sanz-Tejedor、Ángela Meana、Justo F. Rodríguez、José L. García-Ruano
DOI:10.1055/s-2003-41013
日期:——
Annular dibromination of hydroxypyridines with NBS in acetonitrilefollowed by bromine-lithium exchange with RLi and subsequent trappingwith H2O or I2 afforded monobromo and bromoiododerivatives in a completely regioselective way. Iodination of bromohydroxypyridines with NIS is totally regioselective.