Rhodium(<scp>i</scp>)-catalyzed mono-selective C–H alkylation of benzenesulfonamides with terminal alkenes
作者:Supriya Rej、Naoto Chatani
DOI:10.1039/c9cc05219d
日期:——
The Rh(I)-catalyzed ortho-alkylation of benzenesulfonamides with alkenes with the aid of an 8-aminoquinoline directing group is reported. The reaction is applicable to a variety of benzenesulfonamide derivatives and various alkenes. Curiously, unactivated 1-alkenes were more reactive than activated alkenes. Deuterium labeling experiments indicate that an unusual 1,2-H shift mechanism to generate a
Phosphaannulation of Aryl- and Benzylphosphonic Acids with Unactivated Alkenes<i>via</i>Palladium-Catalyzed CH Activation/Oxidative Cyclization Reaction
作者:Woo Hyung Jeon、Jeong-Yu Son、Sun-Eung Kim、Phil Ho Lee
DOI:10.1002/adsc.201400793
日期:2015.3.9
An efficient phosphaannulation via palladium(II)‐catalyzed CH activation/oxidative cyclization by the 6‐endo mode is reported for the synthesis of 3‐substituted phosphaisocoumarins from the reaction of arylphosphonic acids with unactivated alkenes under aerobic conditions. Also, α,α‐disubstituted benzylphosphonic acids were phosphaannulated with unactivated alkenes, producing phosphaisochromanones
Mild and Selective H/D Exchange at the β Position of Aromatic α-Olefins by N-Heterocyclic Carbene-Hydride-Rhodium Catalysts
作者:Andrea Di Giuseppe、Ricardo Castarlenas、Jesús J. Pérez-Torrente、Fernando J. Lahoz、Victor Polo、Luis A. Oro
DOI:10.1002/anie.201007238
日期:2011.4.18
Pacman bites selectively! Stable rhodium(III)–N‐heterocyclic carbene–hydride complexes (Pacman‐like catalysts) are highly active and selective catalysts for H/D exchange at the β position of aromatic α‐olefins (see picture). The interplay between bulky N‐heterocycliccarbene and quinolinate ligands determines the size of the steric window responsible for this selectivity.
Pd-Catalyzed Regioselective Arylboration of Vinylarenes
作者:Kai Yang、Qiuling Song
DOI:10.1021/acs.orglett.6b02527
日期:2016.11.4
A palladium-catalyzed 1,2-arylboration of vinylarenes with aryldiazonium tetrafluoroborates and bis(pinacolato)diboron has been disclosed. It is reported for the first time that styrene derivatives can be successfully employed as good substrates for 1,2-arylboration of alkenes. Mechanistic studies suggest that no Pd–H reinsertion occurred under our standard conditions, which is the key for the success
Synthesis of 1,1,1-Tris(boronates) from Vinylarenes by Co-Catalyzed Dehydrogenative Borylations–Hydroboration
作者:Lei Zhang、Zheng Huang
DOI:10.1021/jacs.5b11366
日期:2015.12.23
The selective preparation of 1,1,1-tris-(boronates) from vinylarenes and bis(pinacolato)diboron is described. The reactions occur at ambient temperature with excellent selectivity, high yields, and good functional group tolerance. Mechanistic studies suggest that Co(I)-catalyzed double dehydrogenative borylations generate a 1,1-diborylalkene intermediate, which undergoes hydroboration with pinacolborane formed in situ to yield 1,1,1-tris (boronate).