Efficient Regioselective Synthesis and Potential Antitumor Evaluation of Isoxazolo[5,4-<i>b</i>]pyridines and Related Annulated Compounds
作者:Wafaa S. Hamama、Mona E. Ibrahim、Hanafi H. Zoorob
DOI:10.1002/ardp.201100258
日期:2012.6
the corresponding isoxazolo[5,4‐b]pyridines. Treatment of 1 with 2,6‐dibenzylidenecyclohexanone or 2‐benzylidenedimedone afforded the corresponding isoxazolo[5,4‐b]quinoline derivatives. 4,6,8,9‐Tetrahydroisoxazolo[5,4‐b]quinolin‐5‐one derivative was also obtained by multicomponent condensation reaction of 1 with dimedone and benzaldehyde. Heterocyclic annulation of the isoxazolo[5,4‐b]pyridine system
Construction of highly substituted pyrazole derivatives with P–C bond: access to racemic and enantioselective forms by conjugate addition of diarylphosphane oxides to α,β-unsaturated pyrazolones
作者:Zhi-Cong Geng、Jin-Xin Zhang、Ning Li、Jian Chen、Xiao-Fei Huang、Shao-Yun Zhang、Hai-Yan Li、Jing-Chao Tao、Xing-Wang Wang
DOI:10.1016/j.tet.2013.11.038
日期:2014.1
The synthesis of organophosphorus compounds is of great importance to industrial, agricultural, and pharmaceutical chemistry. In this paper, we have reported the synthesis of highly substituted pyrazole derivatives through P–C bond formation under catalyst-free conditions. On the other hand, the first catalytic asymmetric version of this reaction has also been developed under catalysis by an isosteviol
Quinine-catalyzed asymmetric domino Michael-cyclization reaction for the synthesis of spirocyclic oxindoles bearing two spiro quaternary centers and three consecutive stereocenters
An efficient organocatalytic diastereo- and enantioselective method for the construction of spirocyclic oxindole derivatives bearing twospiroquaternarycenters and three consecutive stereocenters via a domino Michael/cyclization process has been developed. Using commercially available quinine as catalyst, the reactions of 3-isothiocyanato oxindoles with unsaturated pyrazolones and unsaturated isoxazolones
Pyridinium Ylide-Mediated Diastereoselective Synthesis of Spirocyclopropanyl-pyrazolones via Cascade Michael/Substitution Reaction
作者:Akanksha Kumari、Dhirajkumar Jitendrabhai Patanvadiya、Anshul Jain、Ranjan Patra、Manikandan Paranjothy、Nirmal K. Rana
DOI:10.1021/acs.joc.3c02879
日期:2024.6.7
We have devised a highly diastereoselective formal [2 + 1] annulation reaction of arylidene/alkylidine-pyrazolones with in situ-generated supported as well as standard pyridinium ylides to construct spirocyclopropanyl-pyrazolones. The cascade approach exhibits a wide range of functional group tolerance, gram-scale capability, and substrate versatility. A diverse range of spirocyclic cyclopropanes was