Direct Synthesis of N-Unsubstituted 4-Aryl-1,2,3-triazoles Mediated by Amberlyst-15
摘要:
A highly efficient and effective method for the synthesis of N-unsubstituted 4-aryl-1,2,3-triazoles promoted by Amberlyst-15 is described. The promoter can be recycled and reused up to eight times without any reduction in its catalytic activity.
Multifunctional isoquinoline-oxazoline ligands of chemical and biological importance
作者:Wei Li、Guotong Wang、Jixing Lai、Shengkun Li
DOI:10.1039/c9cc01790a
日期:——
Multifunctional isoquinoline-oxazolines (MIQOXs) were conceived and synthesized from commercially available chiral amino acids. The multifunctional role of MIQOXs was demonstrated by Pd-catalyzed highly enantioselective addition of arylboronic acids to nitrostyrenes, and by the discovery of novel antifungal candidates.
Organocatalytic Asymmetric Michael Addition of Oxindoles to Nitroolefins for the Synthesis of 2,2-Disubstituted Oxindoles Bearing Adjacent Quaternary and Tertiary Stereocenters
A bifunctional thiourea-catalyzed Michael addition of activated indolin-3-ones to nitroolefins has been developed. The synthetically useful 2,2-disubstituted indolin-3-one derivatives with vicinal chiral quaternary–tertiary stereocenters were obtained in high yields with excellent stereoselectivities. The adduct can be readily transformed into a structurally interesting heterocyclic architecture by
An Asymmetric Organocatalytic Approach to Michael Reactions of Thiazolones and Nitroalkenes: Preparation of Compounds with Anti-Cancer Potency
作者:Xiaodong Liu、Hongjin Song、Qiao Chen、Wenyi Li、Wen Yin、Ming Kai、Rui Wang
DOI:10.1002/ejoc.201201094
日期:2012.10.9
highly efficient strategy for obtaining a series of chiral 2,4-disubstituted thiazolone derivatives with excellent diastereo- and enantioselectivities through the creation of carbon- and nitrogen-substituted quaternary carbon stereocenters. With the chiral tertiary amine-thiourea catalyst developed by our group, the reactions could be performed smoothly at 1 mol-% catalyst loadings without any additive
A copper-catalyzed method for the synthesis of imidazo[1,2-a]pyridines with aminopyridines and nitroolefins using air as oxidation agent in a one-pot procedure has been developed. In this process, the reaction appears to be very general and suitable for construction of a variety of imidazo[1,2-a]pyridines.
开发了一种铜催化的一锅法,以空气为氧化剂,与氨基吡啶和硝基烯烃合成咪唑并[1,2- a ]吡啶。在此过程中,反应似乎非常普遍,适合于构建各种咪唑并[1,2- a ]吡啶。
New approach to the preparation of bicyclo octane derivatives via the enantioselective cascade reaction catalyzed by chiral diamine-Ni(OAc)2 complex
作者:Wenyi Li、Xiaodong Liu、Zhifeng Mao、Qiao Chen、Rui Wang
DOI:10.1039/c2ob25135c
日期:——
efficient catalyst system assembled from enantiomerically pure diaminocyclohexane and Ni(OAc)2 is, for the first time, used to catalyze the cascade Michael–Henry reaction of various diones and substituted nitroalkenes. A series of polyfunctionalized bicyclo[3.2.1]octane derivativescontainingfour stereogenic centers are prepared with excellent enantioselectivities (up to >99% ee) and diastereoselectivities