Enantioselective Pallada‐Electrocatalyzed C−H Activation by Transient Directing Groups: Expedient Access to Helicenes
作者:Uttam Dhawa、Cong Tian、Tomasz Wdowik、João C. A. Oliveira、Jiping Hao、Lutz Ackermann
DOI:10.1002/anie.202003826
日期:2020.8.3
Asymmetric pallada‐electrocatalyzed C−H olefinations were achieved through the synergistic cooperation with transient directing groups. The electrochemical, atroposelective C−H activations were realized with high position‐, diastereo‐, and enantio‐control under mild reaction conditions to obtain highly enantiomerically‐enriched biaryls and fluorinated N−C axiallychiral scaffolds. Our strategy provided
One-Pot Amberlyst 15-Controlled Cyclocondensation of Piperidines and Arylaldehydes: Synthesis of 3,5-Diarylmethylpyridines
作者:Meng-Yang Chang、Yu-Lin Tsai
DOI:10.1021/acs.joc.9b03315
日期:2020.4.17
Amberlyst 15-controlled one-pot easy-operational intermolecular cyclocondensation of substituted piperidines with arylaldehydes provides diversified 3,5-diarylmethylpyridines in high to excellent yields under refluxing toluene conditions. The uses of various acidic solid supports and reaction solvents are investigated for facile and efficient transformation. A plausible mechanism has been proposed
Enantioselective Synthesis of Atropisomers Featuring Pentatomic Heteroaromatics by Pd-Catalyzed C–H Alkynylation
作者:Shuo Zhang、Qi-Jun Yao、Gang Liao、Xin Li、Han Li、Hao-Ming Chen、Xin Hong、Bing-Feng Shi
DOI:10.1021/acscatal.8b04870
日期:2019.3.1
heteroarenes, including pyrroles, thiophenes, benzothiophenes, and benzofurans were compatible with this protocol. Notably, this strategy offers the catalytic asymmetric synthesis of axially chiral 3,3′-bisbenzothiophene with good ee (93% ee). Computational studies revealed the key structural elements that differentiate the rotational barriers of benzothiophene and benzofuran moieties.
Virtual screening studies have identified a series of phenylpyrroles as novel 5-HT7 receptor ligands. The synthesis and the affinity for the 5-HT7 receptor of these phenylpyrroles are described. Some of these compounds exhibited high affinity for the 5-HT7 receptors. (c) 2005 Elsevier Ltd. All rights reserved.