In the presence of 10 mol % of Ni(acac)(2), four components comprising Me(2)Zn, alkynes, 1,3-butadiene, and carbonyl compounds combine in this order in 1:1:1:1 ratio to furnish (3E,6Z)-octadien-1-ols 1 in good yields. Similarly, the coupling reaction of Me(2)Zn, 1,omega-dienynes 5, and carbonyls furnishes 1-alkylidene-2-(4'-hydroxy-(1'E)-alkenyl)cyclopentanes and -cyclohexanes 6 and their oxygen and
Olefin-Migrative Cleavage of Cyclopropane Rings through the Nickel-Catalyzed Hydrocyanation of Allenes and Alkenes
作者:Hiroto Hori、Shigeru Arai、Atsushi Nishida
DOI:10.1002/adsc.201601400
日期:2017.4.3
A nickel‐catalyzed hydrocyanation triggered by hydronickelation of the carbon‐carbon double bonds of allenes followed by cyclopropane cleavage is described. The observed regio‐ and stereochemistries in the products are strongly influenced by the initial hydronickelation step, and allenyl‐ and methylenecyclopropanes reacted smoothly to promote the cleavage of cyclopropane. In contrast, this cleavage
作者:Sang Ick Lee、Se Yeoun Park、Ji Hoon Park、Il Gu Jung、Soo Young Choi、Young Keun Chung、Bun Yeoul Lee
DOI:10.1021/jo051685u
日期:2006.1.1
A rhodium complex of N-heterocyclic carbene (NHC) has been developed for intra- and intermolecular [4 + 2] and intramolecular [5 + 2] cycloadditionreactions. This is the first use of a transition-metal NHC complex in a Diels−Alder-type reaction. For the intramolecular [4 + 2] cycloadditionreactions, all the dienynes studied were converted to their corresponding cycloadducts in 91−99% yields within
Ni(acac)2 catalyzes the five-component connection reaction of Me2Zn, alkynes, diene (of 1,3-dien-8-ynes and 1,3-dien-9-ynes), aldehydes and anisidine to furnish cyclic dienyl amines anti-2 with high remote 1,5-diastereoselectivity.
Remarkably High 1,5-Diastereoselectivity in a Nickel-Catalyzed Conjugate Addition of Me2Zn and Carbonyl Compounds to 1,-Dienynes with Through-Space Coupling