Highly Regio- and Stereoselective Palladium(0)-Catalyzed Addition of Organoboronic Acids with 1,2-Allenic Sulfones, Sulfoxides, or Alkyl- or Aryl-Substituted Allenes in the Presence of Acetic Acid: An Efficient Synthesis of <i>E</i>-Alkenes
作者:Shengming Ma、Hao Guo
DOI:10.1055/s-2007-983822
日期:2007.9
reaction conditions were established to enable the palladium(0)-catalyzed addition of organoboronicacids with 1,2-allenic sulfones, sulfoxides, or alkyl- or aryl-substituted allenes in the presence of acetic acid. This reaction provides a new way for the stereoselective synthesis of tri- or tetrasubstituted E-alkenes. With arylboronic acids, the reactions of 1,2-allenic sulfones, sulfoxides, and alkyl-substituted
Regioselective Allene Hydroarylation via One-Pot Allene Hydrosilylation/Pd-Catalyzed Cross-Coupling
作者:Zachary D. Miller、John Montgomery
DOI:10.1021/ol502766q
日期:2014.10.17
Advances in hydroarylation have been achieved by the development of a one-pot regioselective allene hydrosilylation/Pd(0)-catalyzed cross-coupling protocol. The regioselectivity is primarily governed by N-heterocycliccarbene (NHC) ligand identity in the hydrosilylation step and is preserved in the subsequent cross-coupling reaction. This methodology affords streamlined access to functionalized 1,1-disubstituted
A General and Highly Selective Chelate-Controlled Intermolecular Oxidative Heck Reaction
作者:Jared H. Delcamp、Alexandria P. Brucks、M. Christina White
DOI:10.1021/ja804120r
日期:2008.8.27
chelate-controlled intermolecular oxidativeHeck reaction is reported that proceeds with a wide range of nonresonance stabilized alpha-olefin substrates and organoboron reagents to afford internal olefin products in good yields and outstanding regio- and E: Z stereoselectivities. Pd-H isomerization, common in many Heck reactions, is not observed under these mild, oxidative conditions. This is evidenced
An efficient and environmentally friendly organophotoredox-catalyzed method for the synthesis of β-fluorocarboxylic esters is developed.
一种高效且环保的有机光还原催化合成β-氟羧酸酯的方法被开发。
Metal-Free, NHPI Catalyzed Oxidative Cleavage of C–C Double Bond Using Molecular Oxygen as Oxidant
作者:Riyuan Lin、Feng Chen、Ning Jiao
DOI:10.1021/ol3018215
日期:2012.8.17
A metal-free N-hydroxyphthalimide (NHPI) catalyzed aerobic oxidative cleavage of olefins has been developed. Molecular oxygen is used as the oxidant and reagent for this oxygenation reaction. This methodology has prevented the use of toxic metals or overstoichiometric amounts of traditional oxidants, showing good economical and environmental advantages. Based on the experimental observations, a plausible mechanism is proposed.