Chiral bipyridine-annulated bicyclo[3.3.1]nonane N-oxide organocatalysts for stereoselective allylation and hydrosilylation reactions
作者:Simona Žeimytė、Sigitas Stončius
DOI:10.1016/j.tet.2020.131831
日期:2021.1
The synthesis of chiral C2-symmetric bis(bipyridine N,N′-dioxide) and bis(bipyridine N-monooxide) derivatives featuring bipyridine-annulated bicyclo[3.3.1]nonane framework is reported. The new Lewis basic bipyridine N,N′-dioxides exhibited good catalytic activity in the asymmetric allylation of aldehydes with allyltrichlorosilane, furnishing corresponding homoallylic alcohols in up to 75% ee. Reduction
报道了具有联吡啶环化的双环[3.3.1]壬烷骨架的手性C 2对称双(联吡啶N,N'-二氧化物)和双(联吡啶N-一氧化物)衍生物的合成。新的路易斯碱性联吡啶N,N'-二氧化物在醛与烯丙基三氯硅烷的不对称烯丙基化反应中显示出良好的催化活性,提供了高达75%ee的相应的均烯丙基醇。联吡啶N,N'催化三氯硅烷还原酮亚胺和β-烯胺酯-二氧化物的收率很高,但对映选择性中等(38-54%ee);在室温下,α-亚氨基酯的还原可达到良好的不对称诱导水平(高达73%ee)。