Reaction of Alkynyl- and Alkenyltrifluoroborates with Propargyldicobalt Cations: Alkynylation, Alkenylation, and Cyclopropanation Product Pathways
作者:Brent St Onge、S. Maryamdokht Taimoory、Jeffrey Battersby、John F. Trant、James R. Green
DOI:10.1021/acs.joc.1c02352
日期:2021.12.17
alkenyltrifluorobrates directly alkenylate, predominantly with the retention of stereochemistry. C-1-substituted alkenyltrifluoroborates alkenylate at C-2. Potassium vinyltrifluoroborate incorporates a cyclopropane at the site propargyl to alkynedicobalt. Computational analysis of these systems explains the differential modes of reactivity of alkenyltrifluoroborates and outlines the probable mechanisms for
乙酸炔丙酯-Co 2 (CO) 6的路易斯酸介导的尼古拉斯反应描述了与一系列炔基三氟硼酸钾和烯基三氟硼酸钾的配合物。炔基三氟硼酸盐直接将中间炔丙基二钴阳离子炔基化。相反,烯基三氟硼酸盐通过三种主要反应模式之一进行:C-2-取代的烯基三氟硼酸盐直接烯基化,主要保留立体化学。C-1-取代的烯基三氟硼酸盐在C-2 上烯基化物。乙烯基三氟硼酸钾在炔丙基与炔钴的位点结合了环丙烷。这些系统的计算分析解释了烯基三氟硼酸盐的不同反应模式,并概述了每种产物形成的可能机制。