Nickel-Catalyzed Organozinc-Promoted Carbocyclizations of Electron-Deficient Alkenes with Tethered Unsaturation
作者:John Montgomery、Eric Oblinger、Alexey V. Savchenko
DOI:10.1021/ja9702125
日期:1997.5.1
A nickel-catalyzed method for cyclizations of electron-deficient alkenes with tethered unsaturation in the presence of organozincs was developed. Considerable flexibility in the structure of each reactive component was observed. Enones, alkylidene malonates, unsaturated β-ketoesters, and nitroalkenes participated as the electron-deficient alkene; alkynes, enones, 1,3-dienes, and aldehydes participated
开发了一种镍催化的方法,用于在有机锌存在下对具有束缚不饱和度的缺电子烯烃进行环化。观察到每个反应组件的结构具有相当大的灵活性。烯酮、亚烷基丙二酸酯、不饱和β-酮酯和硝基烯烃作为缺电子烯烃参与;炔烃、烯酮、1,3-二烯和醛作为系链不饱和键参与;以及各种 sp2 和 sp3 杂化的有机锌,包括那些具有 β-氢的有机锌,作为亲核组分参与其中。底物结构、有机锌结构和配体结构都在决定产物选择性方面发挥了重要作用。具有特殊合成意义的是从普通炔烃制备 E 或 Z 三或四取代烯烃的机会。