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。
Competition between insertion and conjugate addition in nickel-catalyzed couplings of enones with unsaturated functional groups
作者:John Montgomery、Jeongbeob Seo、Helen M.P Chui
DOI:10.1016/0040-4039(96)01528-6
日期:1996.9
The intra- and intermolecular couplings of enones with alkynes or enones in the presence of organozincs under Ni(COD)2 catalysis resulted in three general reaction pathways: direct conjugateaddition, cyclization with alkylation, and cyclization with reduction. The effects of substrate structural variations on selectivities among these three pathways were investigated.
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。
Cascade Cyclizations and Couplings Involving Nickel Enolates
作者:Gireesh M. Mahandru、Andy R. L. Skauge、Sanjoy K. Chowdhury、Kande K. D. Amarasinghe、Mary Jane Heeg、John Montgomery
DOI:10.1021/ja037423w
日期:2003.11.1
A new strategy for effecting cascade cyclization processes using nickel enolates has been developed. Nickel enolates may be cleanly generated by the oxidative cyclization of an enal and alkyne with Ni(0), and the resulting enolate may be functionalized by a variety of alkylation processes. Partially and fully intramolecular versions of the process allow the rapid synthesis of complex polycyclics from simple achiral, acyclic precursors.
Nickel-Catalyzed Cyclizations of Alkynyl Enones with Concomitant Stereoselective Tri- or Tetrasubstituted Alkene Introduction
作者:John Montgomery、Alexey V. Savchenko
DOI:10.1021/ja952026+
日期:1996.1.1
Diverse Reactivity Manifolds of Alkynyl Enone- and Alkynyl Enal-Derived Nickelacycles: Discovery of Nickel-Promoted [3+2] and [2+1] Cycloadditions
作者:Sanjoy K. Chowdhury、Kande K. D. Amarasinghe、Mary Jane Heeg、John Montgomery