Remarkable Dependence of Diastereoselectivity on Anhydrous or Aqueous Solvent in the Indium Hydride Promoted Reductive Aldol Reaction of α,β-Unsaturated Ketones
作者:Katsuyuki Inoue、Tatsuya Ishida、Ikuya Shibata、Akio Baba
DOI:10.1002/1615-4169(200206)344:3/4<283::aid-adsc283>3.0.co;2-s
日期:2002.6
Dichloroindium hydride generated by the transmetallation between tributyltin hydride and indium trichloride predominantly reduced α,β-unsaturated ketones (enones) with 1,4-selectively even in the presence of aldehydes. Under anhydrous conditions, the successive aldol reaction between the resulting enolates and the remaining aldehydes proceeded with high anti-selectivity. The stereochemistry was dramatically
通过三丁基氢化锡和三氯化铟之间的金属转移反应生成的氢化二氯铟即使在醛的存在下也主要用 1,4-选择性还原 α,β-不饱和酮(烯酮)。在无水条件下,所得烯醇化物和剩余醛之间的连续羟醛反应以高反选择性进行。通过分别使用水和甲醇作为添加剂和溶剂,立体化学被显着逆转为顺式选择性。