Wacker oxidation of alkenes using a fluorous biphasic system. A mild preparation of polyfunctional ketones
摘要:
Various alkenes are oxidized to the corresponding ketones using t-BuOOH in the presence of a palladium(II) catalyst bearing perfluorinated ligands using a biphasic solvent system of benzene and bromoperfluorooctane. (C) 1998 Elsevier Science Ltd. All rights reserved.
Catalytic Asymmetric Addition of Alkylzinc and Functionalized Alkylzinc Reagents to Ketones
作者:Sang-Jin Jeon、Hongmei Li、Celina García、Lynne K. LaRochelle、Patrick J. Walsh
DOI:10.1021/jo048683e
日期:2005.1.1
We describe our full report of the catalytic asymmetricaddition of simple and functionalized dialkylzinc reagents to a broad range of saturated ketones and enones. The functionalized organozinc reagents contain esters, silyl ethers, alkyl chlorides, and alkyl bromides. In general, the resulting tertiary alcohol products are isolated with high ee's. With some substrates, yields are low as a result
Nickel-Catalyzed Preparations of Functionalized Organozincs
作者:Stephan Vettel、Andrea Vaupel、Paul Knochel
DOI:10.1021/jo960808v
日期:1996.1.1
(X = Br, Cl) via a halogen-zinc exchange reaction. The treatment of terminal alkenes with diethylzinc (neat, 25-60 degrees C) in the presence of Ni(acac)(2) as a catalyst (1-5 mol %) and 1,5-cyclooctadiene (COD) affords the corresponding dialkylzincs via a hydrozincation reaction. Whereas the conversion for simple alkenes bearing a remote functionality reaches 40 to 63%, the hydrozincation of allylic
Mn-Catalysed photoredox hydroxytrifluoromethylation of aliphatic alkenes using CF<sub>3</sub>SO<sub>2</sub>Na
作者:Wenhao Long、Pengcheng Lian、Jingjing Li、Xiaobing Wan
DOI:10.1039/d0ob01322f
日期:——
This work demonstrated the photoinduced hydroxytrifluoromethylation of aliphaticalkenes catalysed by Mn(acac)3. The synthesis uses an inexpensive catalyst under mild reaction conditions, and exhibits a wide substrate scope and excellent functional group tolerance.
A new preparation of diorganozincs from olefins via a nickel catalyzed hydrozincation
作者:Stephan Vettel、Andrea Vaupel、Paul Knochel
DOI:10.1016/0040-4039(94)02438-h
日期:1995.2
The reaction of olefins with diethylzinc in the presence of catalytic amounts of Ni(acac)2 provides dialkylzincs (neat, 40–50 °C, 2–6 h). These zinc reagents can be trapped by various electrophiles or used for the catalyticasymmetricaddition to aldehydes (> 85 % ee). Allylic and homoallylic alcohols are especially good substrates for the reaction.
One-Pot Strategy for Thiazoline Synthesis from Alkenes and Thioamides
作者:Nur-E Alom、Fan Wu、Wei Li
DOI:10.1021/acs.orglett.7b00079
日期:2017.2.17
convenient synthesis of a privileged pharmaceutical motif, thiazoline is accomplished. This reaction utilizes simple and readily available alkene and thioamide substrates in an intermolecular fashion via a simple one-pot procedure. A wide range of functional groups is tolerated, and the thiazoline product has been further utilized for the synthesis of the corresponding β-aminothiol and thiazole from routine