no)methyl]pyridine. It was used in the asymmetricintramolecularhydroamination of amino-1,3-dienes, with the desired products being obtained in good yields and with excellent regioselectivities and up to moderate enantioselectivities. The absolute configuration of one of the hydroamination products was determined by X-ray crystallography studies. This simple and efficient procedure can be used for
Palladium-Catalyzed Ring-Closing Reaction via C–N Bond Metathesis for Rapid Construction of Saturated <i>N</i>-Heterocycles
作者:Bangkui Yu、Suchen Zou、Hongchi Liu、Hanmin Huang
DOI:10.1021/jacs.0c10615
日期:2020.10.28
The ring-closingreactions based on chemical bond metathesis enable the efficient construction of a wide variety of cyclic systems which receive broad interest from medicinal and organic communities. However, the analogous reaction with C-N bond metathesis as a strategic fundamental step remains an unanswered challenge. Herein, we report the design of a new fundamental metallic C-N bond metathesis reaction
Regio- and Enantioselective Hydroamination of Dienes by Gold(I)/Menthol Cooperative Catalysis
作者:Osamu Kanno、Wataru Kuriyama、Z. Jane Wang、F. Dean Toste
DOI:10.1002/anie.201104076
日期:2011.10.10
Alcohol is key: Regio‐ and enantioselectivehydroamination of 1,3‐dienes has been achieved with the dinuclear catalyst (R)‐DTBM‐SEGPHOS. The rate and selectivity of the reaction are enhanced by alcohol additives like menthol, which coordinates the cationic gold(I) to generate a Brønsted acid that can participate in catalysis. Mbs=p‐methoxybenzenesulfonyl.
醇是关键:已使用双核催化剂 ( R )-DTBM-SEGPHOS实现了 1,3-二烯的区域选择性和对映选择性加氢胺化。醇类添加剂如薄荷醇可提高反应的速率和选择性,薄荷醇与阳离子金 (I) 配位以生成可参与催化的布朗斯台德酸。Mbs=对甲氧基苯磺酰基。
A Carbaboranylmercuric Salt Catalyzed Reaction; Highly Regioselective Cycloisomerization of 1,3-Dienes
The combination of carbaboranylmercuric chloride (new type of bulky Lewis acid) and silver triflate efficiently catalyzes cycloisomerization of 1, 3-dienes at room temperature. The catalytic system gives allyl-substituted azacycles and cycloalkanes in excellent yields with high to complete regioselectivity.