Enzymatic Synthesis of Optically Active a-Hydroxybenzylpyridines
摘要:
Synthesis of optically active alpha-hydroxybenzylpyridines by asymmetric reduction of benzoylpyridines and benzoylpyridine N-oxides with baker's yeast, and enantioselective esterification of racemic alpha-hydroxybenzylpyridines by use of lipase PS have been described.
Iodo- or 2-bromopyridine N-oxides were readily magnesiated with i-PrMgCl·LiCl via the iodine or bromine−magnesium exchange. The bromine adjacent to pyridineN-oxide (at the 2- or 6-position) can be regioselectively magnesiated in the presence of other position substituted halogens. This method was tested in various substituted pyridineN-oxide systems, and has been successfully applied to the total
Synthesis of optically active alpha-hydroxybenzylpyridines by asymmetric reduction of benzoylpyridines and benzoylpyridine N-oxides with baker's yeast, and enantioselective esterification of racemic alpha-hydroxybenzylpyridines by use of lipase PS have been described.