Trimethylsilyl Trifluoromethanesulfonate
Mediated Addition-Cyclization of N-Vinyloxazolidin-2-ones
to Nitrones: An Efficient Access to 4-Substituted 5-Azaisoxazolidines
Stereoselective Synthesis of Highly Substituted Enamides by an Oxidative Heck Reaction
作者:Yu Liu、Dan Li、Cheol-Min Park
DOI:10.1002/anie.201101550
日期:2011.8.1
Functionalization of enamides under Heck conditions has been limited to those with unsubstituted vinyl groups. By tuning reaction parameters that allow for the balance between stability and reactivity of reactants, the oxidativeHeck cross‐coupling to produce highlysubstitutedenamides in good to excellent yields was achieved (see scheme).
An efficient copper-catalyzed method for the regioselective synthesis of β-difluoroester substituted enamides using BrCF2CO2Et is reported for the first time.
Anti-Markovnikov stereoselective hydroamination and hydrothiolation of (hetero)aromatic alkynes using a metal-free cyclic trimeric phosphazene base
作者:Na Zhao、Chengdong Lin、Lirong Wen、Zhibo Li
DOI:10.1016/j.tet.2019.04.075
日期:2019.6
Hydroamination and hydrothiolation are the most efficient and completely atom-economical process to construct important enamine and vinylsulfide intermediates in pharmaceutical and organic chemistry. The cyclic trimeric phosphazene base (CTPB) showed great catalytic activity for the anti-Markovnikov stereoselective hydroamination and hydrothiolation of alkynes in good to excellent yields. A broad
The copper(I)-catalyzed hydroboration of alkynamides with B2pin2 afforded the alkenamide boronates in 66% to nearly quantitative yields with high regio- and stereo-selectivity. It was interesting to note that the regio-selectivity of the reaction is opposite to that observed in the carbometallation reaction of alkynamides, and the resulting alkenyl boronates provided access to alpha,beta-disubstituted
Copper-catalyzed and highly chemoselective reduction of N-alkynylamides by a boronaddition–protonolysis protocol is presented. The reaction proceeds with the addition of boryl-copper complex to N-alkynylamides with high regioselectivity and stereoselectivity, followed by regiocontrolled transmetallation of the α-site of the alkenylboronate with MeOCuL to afford N-alkenylamides in good yields. Deuterium