6-disubstituted pyridine derivative with an oxazaborolidine and N-ethyl-N-isopropyl aniline-borane complex gave the corresponding (S)-lactone derivative 5 in 96% ee almost quantitatively. Hydrogenolytic cleavage of 5 gave the expected (S)-2-(1-hydroxyethyl)pyridine derivative.
用氧氮杂
硼烷和 N-乙基-
N-异丙基苯胺-
硼烷复合物对 2-乙酰基-3,6-二取代
吡啶衍生物的酮基进行
化学计量不对称还原,得到相应的 (S)-内酯衍
生物 5,其 ee 几乎为 96%数量上。5的氢解裂解得到预期的(S)-2-(1-羟乙基)
吡啶衍生物。