Nickel-catalyzed Conjugate Addition of Arylboron Reagents to α,β-Unsaturated Carbonyl Compounds with the Aid of a Catalytic Amount of an Alkyne
作者:Eiji Shirakawa、Yuichi Yasuhara、Tamio Hayashi
DOI:10.1246/cl.2006.768
日期:2006.7
Alkynes in combination with a catalytic amount of a nickel complex were found to catalyze the conjugate addition of arylboron reagents to α,β-unsaturated carbonyl compounds, where use of an optical...
Synthesis of virtually enantiopure aminodiols with three adjacent stereogenic centers by epoxidation and ring-opening
作者:Lan Luo、Hisashi Yamamoto
DOI:10.1039/c5ob01808k
日期:——
Synthesis of virtually enantiopure aminodiols with three consecutive stereocenters is accomplished by a sequential cascade of epoxidation and ring-opening.
通过环氧化和环开启的顺序级联反应,可以合成具有三个连续立体中心的几乎对映纯的氨基二醇。
Trifluoromethyl Sulfoxides from Allylic Alcohols and Electrophilic SCF<sub>3</sub> Donor by [2,3]-Sigmatropic Rearrangement
作者:Mayaka Maeno、Norio Shibata、Dominique Cahard
DOI:10.1021/acs.orglett.5b00750
日期:2015.4.17
An electrophilic trifluoromethylthiolation of allylic alcohols produces the corresponding allylic trifluoromethanesulfenates, which spontaneously rearrange into trifluoromethyl sulfoxides via a [2,3]-sigmatropic rearrangement. The reaction is straightforward and proceeds in good to high yields for the preparation of various allylictrifluoromethyl sulfoxides.
Rh(III)-Catalyzed C–H Activation-Initiated Directed Cyclopropanation of Allylic Alcohols
作者:Erik J. T. Phipps、Tomislav Rovis
DOI:10.1021/jacs.9b02156
日期:2019.5.1
annulation onto allylic alcohols initiated by alkenyl C-H activation of N-enoxyphthalimides to furnish substituted cyclopropyl-ketones. Notably, the traceless oxyphthalimide handle serves three functions: directing C-H activation, oxidation of Rh(III), and, collectively with the allylic alcohol, in directing cyclopropanation to control diastereoselectivity. Allylic alcohols are shown to be highly reactive
Polymer-Incarcerated Chiral Rh/Ag Nanoparticles for Asymmetric 1,4-Addition Reactions of Arylboronic Acids to Enones: Remarkable Effects of Bimetallic Structure on Activity and Metal Leaching
Robust and highly active bimetallic Rh nanoparticle (NP) catalysts, PI/CB Rh/Ag have been developed and applied to the asymmetric 1,4-addition of arylboronic acids to enones without leaching of the metals. We found that the structures of the bimetallic Rh/Ag catalysts and chiral ligands strongly affect their catalytic activity and the amount of metal leaching. PI/CB Rh/Ag could be recycled several times by simple operations while keeping high yields and excellent enantioselectivities. To show the versatility of the PI/CB Rh/Ag catalyst, a one-pot, oxidation-asymmetric 1,4-addition reaction of an allyl alcohol and an arylboronic acid was demonstrated by combining the PI/CB Rh/Ag catalyst with PI/CB Au as an aerobic oxidation catalyst.