The initial [2 + 2]-cycloadduct between a chromium aminocarbene and a tethered alkene undergoes a beta-hydrogen elimination very efficiently when triphenylphosphine is added as a ligand. The reaction gives cyclic enamines or homoenamines depending on the substitution on the alkene.
An Expedient Procedure for the Oxidative Cleavage of Olefinic Bonds with PhI(OAc)<sub>2</sub>, NMO, and Catalytic OsO<sub>4</sub>
作者:K. C. Nicolaou、Vikrant A. Adsool、Christopher R. H. Hale
DOI:10.1021/ol100290a
日期:2010.4.2
PhI(OAc)2 in the presence of OsO4 (cat.) and 2,6-lutidine cleaves olefinicbonds to yield the corresponding carbonyl compounds, albeit, in some cases, with α-hydroxy ketones as byproduct. A more practical and clean protocol to effect oxidative cleavage of olefinicbonds involves NMO, OsO4 (cat.), 2,6-lutidine, and PhI(OAc)2.
A three-component radical coupling reaction of aryl alkenes or 1,3-enynes with tert-butyl hydroperoxide and formamides for the efficient synthesis of β-peroxy amides.
Copper-Catalyzed Alkynylboration of Alkenes with Diboron Reagents and Bromoalkynes
作者:Tian-Jun Gong、Shang-Hai Yu、Kuan Li、Wei Su、Xi Lu、Bin Xiao、Yao Fu
DOI:10.1002/asia.201701176
日期:2017.11.16
An efficient method for the synthesis of homopropargylboronates by copper‐catalyzed alkynylboration of alkenes with diboron reagents and bromoalkynes has been developed. The alkynylboration reaction features high selectivity and efficiency, mild reaction conditions, wide substrate scope, and functional‐group compatibility, and is a highly attractive complement to existing methods for the synthesis
Copper- and Cobalt-Catalyzed Direct Coupling of sp<sup>3</sup> α-Carbon of Alcohols with Alkenes and Hydroperoxides
作者:Jun-Kee Cheng、Teck-Peng Loh
DOI:10.1021/ja510635k
日期:2015.1.14
A zerovalent copper- and cobalt-catalyzed direct coupling of the sp(3) α-carbon of alcohols with alkenes and hydroperoxides was developed in which the hydroperoxides acted as radical initiator and then coupling partner. 1,3-Enynes and vinylarenes underwent alkylation-peroxidation to give β-peroxy alcohols and β-hydroxyketones correspondingly with excellent functional group tolerance. The resulting