A highly selective hydrogenation of alkynesusing an air-stable and readily available manganese catalyst has been achieved. The reaction proceeds under mild reaction conditions and tolerates various functional groups, resulting in (Z)-alkenes and allylic alcohols in high yields. Mechanistic experiments suggest that the reaction proceeds via a bifunctional activation involving metal–ligand cooperativity
Development of a polymer bound Wittig reaction and use in multi-step organic synthesis for the overall conversion of alcohols to β-hydroxyamines
作者:Martin H. Bolli、Steven V. Ley
DOI:10.1039/a803612h
日期:——
An efficient combinatorial access to β-hydroxyamines suitable for automation is achieved by the mild oxidation of alcohols to aldehydes by polymer supported perruthenate (PSP), the subsequent clean olefination of the obtained aldehydes by polymer supported Wittig reagents followed by the epoxidation of the olefins by dimethyldioxirane (DMDO), and the final aminolysis of the epoxides with various amines is described.
Methanol as the Hydrogen Source in the Selective Transfer Hydrogenation of Alkynes Enabled by a Manganese Pincer Complex
作者:Jan Sklyaruk、Viktoriia Zubar、Jannik C. Borghs、Magnus Rueping
DOI:10.1021/acs.orglett.0c02151
日期:2020.8.7
The first base metal-catalyzed transfer hydrogenation of alkynes with methanol is described. An air and moisture stablemanganesepincer complex catalyzes the reduction of a variety of different alkynes to the corresponding (Z)-olefins in high yields. The reaction is stereo- and chemoselective and scalable.
Cobalt catalyzed stereodivergent semi-hydrogenation of alkynes using H<sub>2</sub>O as the hydrogen source
作者:Kangkui Li、Ruhima Khan、Xuexin Zhang、Yang Gao、Yongyun Zhou、Heng Tan、Jingchao Chen、Baomin Fan
DOI:10.1039/c9cc01970g
日期:——
Cobalt-catalyzed stereodivergent semi-hydrogenation of internal alkynes to alkenes is developed. The reaction proceeded through transfer hydrogenation under mild conditions using a base metal CoI2 as the catalyst, and H2O/MeOH as the hydrogen source with Zn as the reductant. The E/Z-selectivity of the product could be switched by changing the solvent and by inclusion/exclusion of a bidentate phosphine
开发了钴催化的内部炔烃立体发散性半氢化反应成烯烃。该反应通过在温和条件下使用贱金属CoI 2作为催化剂,H 2 O / MeOH作为氢源,Zn作为还原剂的温和条件下进行转移氢化而进行。产物的E / Z选择性可以通过改变溶剂和包含/排除双齿膦配体(dppe)来切换。该方法提供了一种简单且具有成本效益的途径,用于合成1,2-二癸二烯烯烃。
Ready approach to poly(vinyldiphenylphosphine): A novel soluble polymer for conveniently conducting Wittig reactions
作者:Jing-Jing Ye、Li-Biao Han
DOI:10.1016/j.tetlet.2020.152796
日期:2021.2
The novel poly(vinyldiphenylphosphine) could be easily prepared by using the reactions of the cheap poly(vinyl chloride) with sodium phosphides. Poly(vinyldiphenylphosphine) is soluble in common solvents while its corresponding phosphine oxide is hardly soluble in the solvents. Taking advantage of this different solubility, poly(vinyldiphenylphosphine) could be used as a soluble phosphinopolymer for