The α-Effect in Reactions of sp-Hybridized Carbon Atom: Michael-Type Reactions of 1-Aryl-2-propyn-1-ones with Primary Amines
作者:Ik-Hwan Um、Eun-Ju Lee、Jin-Ah Seok、Kyung-Hee Kim
DOI:10.1021/jo050624t
日期:2005.9.1
mechanism. The α-effect increases as the substituent X in the phenyl ring of 2a−f becomes a stronger electron-donating group. However, the magnitude of the α-effect for the reactions of 2a−f is small (e.g., kNhydrazine/kNglycylglycine = 4.6−13) regardless of the electronic nature of the substituent X. The small βnuc has been suggested to be responsible for the small α-effect. A solvent kinetic isotope
We have developed a transition-metal free trifluoromethylation protocol between enamines and CF3SO2Na. A wide range of β-trifluoromethyl substituted enamines were delivered in moderate to high yields with only E-configurations.
Highly Regioselective Synthesis of Multisubstituted Pyrroles via Ag-Catalyzed [4+1C]<sup>insert</sup> Cascade
作者:Kaixiu Luo、Shuai Mao、Kun He、Xianglin Yu、Junhong Pan、Jun Lin、Zhihui Shao、Yi Jin
DOI:10.1021/acscatal.9b05360
日期:2020.3.20
C–C bond carbenoid formal insertion/cyclization/[1,5]-shift cascade reaction was successfully developed, providing distinct chemo- and regioselective multisubstituted pyrroles. The plausible reaction mechanism involves two catalytic cycles: in the first one, silver ions regioselectively catalyze the C–C bond formal insertion reaction; in the second one, silver ions chemo- and regioselectively control
Gold-catalyzed chemo- and diastereoselective C(sp<sup>2</sup>)–H functionalization of enaminones for the synthesis of pyrrolo[3,4-c]-quinolin-1-one derivatives
作者:Yulei Zhao、Qizhao Duan、Yuanyuan Zhou、Qiyi Yao、Yanzhong Li
DOI:10.1039/c5ob02556g
日期:——
enaminones with diazo compounds for the synthesis of pyrroloquinolinone derivatives under mild reaction conditions has been developed. This methodology was realized by relay actions of Au and TsOH in a one-pot multistep manner. Initially, the Au-catalyzed reaction of enaminones with diazo compounds affords chemo- and diastereoselective C(sp2)–H functionalized products, which then undergo subsequent
Abstract An efficient copper-catalyzedselectivesynthesis of highly functionalized pyridones by the reaction of enaminones with alkynes is reported. The reactions proceed to afford polysubstituted pyridone derivatives in good to high yields using CuI as the catalyst in MeCN under nitrogen. An efficient copper-catalyzedselectivesynthesis of highly functionalized pyridones by the reaction of enaminones