N-Heterocyclic carbene-catalyzed diastereoselective synthesis of β-lactone-fused cyclopentanes using homoenolate annulation reaction
作者:Subrata Mukherjee、Santigopal Mondal、Atanu Patra、Rajesh G. Gonnade、Akkattu T. Biju
DOI:10.1039/c5cc02960k
日期:——
NHC-catalyzed annulation of enals with 2-enoylpyridines or 2-enoylpyridine N-oxides leading to the diastereoselective synthesis of [small beta]-lactone-fused cyclopentanes is reported. The reaction proceeds via the generation of homoenolate equivalent intermediates and...
Unexpected manganese(iii) acetate-mediated reactions of β-enamino carbonyl compounds with 1-(pyridin-2-yl)-enones under mechanical milling conditions
作者:Zi Liu、Guang-Peng Fan、Guan-Wu Wang
DOI:10.1039/c2cc36360g
日期:——
The solvent-free reactions of beta-enamino carbonylcompounds with 1-(pyridin-2-yl)-enones in the presence of manganese(iii) acetate dihydrate unexpectedly afforded 2-acyl-3-aryl-6,7-dihydro-4(5H)-benzofuran derivatives under mechanical milling conditions.
An Efficient Cyclic Di-AMP Based Artificial Metalloribozyme for Enantioselective Diels-Alder Reactions
作者:Qianqian Qi、Shuting Lv、Min Hao、Xingchen Dong、Youkun Gu、Peizhe Wu、Wenyue Zhang、Yashao Chen、Changhao Wang
DOI:10.1002/ejoc.202000652
日期:2020.8.2
A small cyclic RNA of c‐di‐AMP and Cu2+ ions could assemble into an artificialmetalloribozyme, that is able to catalyze the enantioselectiveDiels–Alderreactions with up to 80 % ee . The presence of c‐di‐AMP in the metalloribozyme not only achieves the chirality transfer but also gives rise to a significant rate enhancement.
Solvent-free enantioselective conjugate addition and bioactivities of nitromethane to Chalcone containing pyridine
作者:Guoping Zhang、Chun Zhu、Dengyue Liu、Jianke Pan、Jian Zhang、Deyu Hu、Baoan Song
DOI:10.1016/j.tet.2016.11.063
日期:2017.1
catalysts in the enantioselective Michael additions of nitromethane to α,β-unsaturated ketones containing pyridine. The best results were obtained with the bifunctional catalyst prepared from 3,5-di(trifluoromethyl)-aniline under solvent-free conditions. This thiourea promoted the reaction with high enantioselectivities and chemical yields for aryl ketones. The origins of enantioselectivity were further
Highly Enantioselective Conjugate Addition of Malononitrile to 2-Enoylpyridines with Bifunctional Organocatalyst
作者:Nagaraju Molleti、Nirmal K. Rana、Vinod K. Singh
DOI:10.1021/ol3015607
日期:2012.9.7
An efficient enantioselective conjugate addition of malononitrile to a range of β-substituted 2-enoylpyridines catalyzed by cinchonaalkaloid-based bifunctional urea catalysts has been developed. Both enantiomers of the products could be achieved with the same level of enantioselectivity by using pseudoenantiomeric catalysts in up to 97% ee and in excellent yields. One of the enantioenriched products