Regioselective Single-Electron Tsuji–Trost Reaction of Allylic Alcohols: A Photoredox/Nickel Dual Catalytic Approach
作者:Zheng-Jun Wang、Shuai Zheng、Eugénie Romero、Jennifer K. Matsui、Gary A. Molander
DOI:10.1021/acs.orglett.9b02473
日期:2019.8.16
A radical-mediated functionalization of allyl alcohol derived partners with a variety of alkyl 1,4-dihydropyridines via photoredox/nickel dual catalysis is described. This transformation transpires with high linear and E-selectivity, avoiding the requirement of harsh conditions (e.g., strong base, elevated temperature). Additionally, using aryl sulfinate salts as radical precursors, allyl sulfones
Co<sub>2</sub>(CO)<sub>8</sub>-mediated Selective Reductions of Propargyl Alcohol Derivatives to Alkenes
作者:Ying Dou、Ping Xing、Zuogang Huang、Biao Jiang
DOI:10.1002/cjoc.201400396
日期:2014.10
In the presence of Co2(CO)8 and additives, propargylalcoholderivatives could be reduced to alkenes in moderate to good yield. The selectivity of this reaction could be controlled by adding different additives: with H2O as the additive, the major configuration of product is Z‐alkene; with CF3COOH as the additive, the major configuration of product is E‐alkene.
Iodomethylzinc Phosphates: Powerful Reagents for the Cyclopropanation of Alkenes
作者:Marie-Christine Lacasse、Cyril Poulard、André B. Charette
DOI:10.1021/ja0529687
日期:2005.9.1
stereocontrol, affording the cyclopropanes of allylic and homoallylic ethers with complete conversions and up to 93% ee. A catalytic version of this reaction using 10 mol % of the chiral phosphate reagent is also disclosed.
开发了一类新的源自磷酸的类锌类化合物,并将其用于烯丙醇和醚以及未官能化烯烃的环丙烷化。使用 3,3'-二取代 BINOL 的手性磷酸可实现有效的立体控制,提供具有完全转化率和高达 93% ee 的烯丙基醚和高烯丙基醚的环丙烷。还公开了使用10mol%手性磷酸盐试剂的该反应的催化形式。
Iron-Catalyzed Coupling Reaction between 1,1-Dichloro-1-alkenes and Grignard Reagents
作者:Bruno Figadère、Mouâd Alami、Mickaël Dos Santos、Xavier Franck、Reynald Hocquemiller、Jean-François Peyrat、Olivier Provot、Jean-Daniel Brion
DOI:10.1055/s-2004-835626
日期:——
This letter reports the coupling reaction of Grignardreagents with 1,1-dichloro-1-alkenes in the presence of the environmentally friendly iron(III) catalyst. This non-toxic procedure is general and provides the di-coupled products as the major compounds. The scope and limitations of this new reaction are described.