Preparation of chiral bipyridine bis-N-oxides by oxidative dimerization of chiral pyridine N-oxides
作者:Scott E. Denmark、Yu Fan
DOI:10.1016/j.tetasy.2005.12.039
日期:2006.2
The direct preparation of chiral 2,2′-bipyridine bis-N-oxides has been developed. The method involves two stages, first, the deprotonation of substituted chiral pyridine N-oxides and second, the oxidative dimerization of the resulting 2-lithiopyridine N-oxides. Optimization of the reaction conditions led to the selection of LiTMP in THF for the deprotonation and molecular iodine as the oxidant. The