system with enantiomeric excesses up to 99.5%. Upon introduction of a readily removable ortho-bromo atom to the phenyl ring, enantiomerically enriched 4-chlorophenylpyridylmethanol was obtained by hydrogenation method with 97.3% ee, which provided an important chiral intermediate for some histamine H1 antagonists.
在Ru-XylSunPhos-Daipen双功能催化体系的存在下,各种对位芳基-
吡啶基酮被氢化,对映体过量高达99.5%。将易于除去的邻
溴原子引入苯环后,通过加氢方法以97.3%ee得到对映体富集的4-
氯苯基
吡啶基
甲醇,这为某些
组胺H 1拮抗剂提供了重要的手性中间体。