Nickel-Catalyzed Markovnikov Transfer Hydrocyanation in the Absence of Lewis Acid
作者:Nils L. Frye、Anup Bhunia、Armido Studer
DOI:10.1021/acs.orglett.0c01454
日期:2020.6.5
Hydrocyanation in the absence of toxic HCN gas is highly desirable. Addressing that challenge, transition-metal-catalyzed transfer hydrocyanation using safe HCN precursors has been developed, but these reagents generally require a Lewis acid for activation, and the control of regioselectivity often remains problematic. In this Letter, a Ni-catalyzed highly Markovnikov-selective transfer hydrocyanation
An Approach to the Regioselective Diamination of Conjugated Di- and Trienes
作者:Anton Lishchynskyi、Kilian Muñiz
DOI:10.1002/chem.201103435
日期:2012.2.20
It's do or diaminate: The selective diamination of 1,3‐butadienes in the presence of hypervalent iodine reagents has been developed. This oxidation process proceeds with complete selectivity in favor of diamination. Depending on the substrate, it proceeds either with 1,2‐ or 1,4‐regioselectivity (see scheme).
bioinsipred gold‐catalyzed tandem Diels–Alder/Diels–Alderreaction of an enynal and a 1,3‐diene, forming the highly‐strained benzotricyclo[3.2.1.02,7]octane skeleton, was reported. In contrast, a Diels–Alder/Friedel–Crafts tandem reaction occurred instead when silver salts were used as the catalyst. Although both reactions experienced the similar Diels–Alderreaction of a pyrylium intermediate with a
hydroalkylation of dienes with stabilized carbon nucleophiles has been made, hydroalkylation of dienes with unstabilized carbon nucleophiles has remained a challenge. In this article, we report a protocol for nickel-catalyzed hydroalkylation of dienes with hydrazones, which serve as equivalents of alkyl carbon nucleophiles. In addition, we developed a protocol for hydroalkenylation of dienes with α,β-unsaturated
Catalyst Controlled Regiodivergent Arylboration of Dienes
作者:Stephen R. Sardini、M. Kevin Brown
DOI:10.1021/jacs.7b05477
日期:2017.7.26
A method for the regiodivergent arylboration of dienes is presented. These reactions allow for the formation of a diverse range of synthetically versatile products from simple precursors. Through mechanistic studies, these reactions likely operate by initial addition of a Cu-Bpin complex across the diene followed by Pd-catalyzed cross coupling with an aryl halide or pseudohalide.