Versatile Pyrrole Synthesis through Ruthenium(II)-Catalyzed Alkene C–H Bond Functionalization on Enamines
作者:Lianhui Wang、Lutz Ackermann
DOI:10.1021/ol303224e
日期:2013.1.4
An efficient ruthenium(II) catalyst enabled broadly applicable oxidative alkyne annulations with electron-rich enamines to provide diversely decorated pyrroles, even in an aerobic fashion with air as the ideal oxidant.
Tetrabutylammonium iodide-catalyzed oxidative coupling of enamides with sulfonylhydrazides: synthesis of β-keto-sulfones
作者:Yucai Tang、Ye Zhang、Kaifeng Wang、Xiaoqing Li、Xiangsheng Xu、Xiaohua Du
DOI:10.1039/c5ob00742a
日期:——
A facile syntheticroutetowards pharmaceutically interesting β-keto-sulfone derivatives by tetrabutylammonium iodide (TBAI)/tert-butyl hydroperoxide (TBHP) mediated oxidative coupling of readily prepared enamides with economical sulfonylhydrazides is described. The corresponding β-keto-sulfone compounds were obtained in moderate to good yields. The present method is metal-free and base-free and shows
Herein, we report a novel synthesis of 1,3‐oxazin‐6‐onesfrom enamides with CO2 through C—H carboxylation and one‐potcyclization. This transition‐metal‐free and redox‐neutral process features broad substrate scope, good functional group tolerance and facile product derivatization. The nucleophilic attack to CO2 from the electron‐rich alkene is demonstrated for this reaction.
Chiral β-Keto Propargylamine Synthesis via Enantioselective Mannich Reaction of Enamides with <i>C</i>-Alkynyl <i>N</i>-Boc <i>N</i>,<i>O</i>-Acetals
作者:Fang-Fang Feng、Shen Li、Chi Wai Cheung、Jun-An Ma
DOI:10.1021/acs.orglett.9b03181
日期:2019.10.18
Propargylamines are an important class of compounds in organic synthesis and drug discovery, yet the synthesis of chiral β-keto propargylamines remains underdeveloped. Herein, we describe a streamlined and general enantioselective Mannichreaction of enamides with C-alkynyl N-Boc N,O-acetals, which serve as readily available C-alkynyl imine precursors, to access a broad range of chiral β-keto N-Boc-propargylamines
Catalytic Asymmetric Access to Noncanonical Chiral α-Amino Acids from Cyclic Iminoglyoxylates and Enamides
作者:Yue Zhang、Jun-Kuan Li、Fa-Guang Zhang、Jun-An Ma
DOI:10.1021/acs.joc.0c00436
日期:2020.4.17
Mannich reaction of cyclic iminoglyoxylates with enamides by virtue of chiral phosphoric acid catalysis in a one-pot manner. The wide substrate scope, mild reaction conditions, and constantly excellent enantioselectivities (>95% ee in most cases) render this protocol highly practical for the rapid construction of valuable noncanonical chiral α-amino-acid building blocks.