Base and catalyst-free synthesis of nitrobenzodiazepines via a cascade N-nitroallylation-intramolecular aza-Michael addition involving o-phenylenediamines and nitroallylic acetates
Naphthoquinone-based chalcone hybrids and derivatives: synthesis and potent activity against cancer cell lines
作者:Guilherme A. M. Jardim、Tiago T. Guimarães、Maria do Carmo F. R. Pinto、Bruno C. Cavalcanti、Kaio M. de Farias、Claudia Pessoa、Claudia C. Gatto、Divya K. Nair、Irishi N. N. Namboothiri、Eufrânio N. da Silva Júnior
DOI:10.1039/c4md00371c
日期:——
Naphthoquinone-based chalcone hybrids were synthesized and evaluated for their cytotoxic activity against four cancer cell lines and PBMC. Some of the hybrids exhibited promising anticancer activity with IC50 values < 1 μM.
Asymmetric synthesis of pyrano[2,3-c]pyrazoles via a cascade reaction between Morita–Baylis–Hillman acetates of nitroalkenes and pyrazolones
作者:Jin Xie、Feng Sha、Xin-Yan Wu
DOI:10.1016/j.tet.2016.05.033
日期:2016.7
The first organocatalytic enantioselective cascade reaction of Morita–Baylis–Hillman acetates of nitroalkenes with pyrazolones has been developed. With 20 mol % of chiral tertiary-amine squaramide, 1,4,5,6-tetrahydropyrano[2,3-c]pyrazoles were afforded in moderate yields (up to 71%) with excellent stereoselectivities (up to>99:1 dr and up to 98% ee).
Synthesis of tetrahydrothiopyrano[2,3-<i>b</i>]indoles <i>via</i> [3+3] annulation of nitroallylic acetates with indoline-2-thiones
作者:Pallabita Basu、Chiranjit Hazra、Thekke V. Baiju、Irishi N. N. Namboothiri
DOI:10.1039/c9nj04754a
日期:——
and stereoselective synthesis of thiopyran annulated indoles. It involves a base mediated cascade [3+3] annulation of indoline-2-thiones and nitroallylic acetates. The tetrahydrothiopyranoindoles which were formed in good yields and in a short reaction time could be easily transformed to triazole derivatives by taking advantage of the nitro group present in the skeleton.
Chiral squaramide-catalyzed asymmetric synthesis of pyranones and pyranonaphthoquinones via cascade reactions of 1,3-dicarbonyls with Morita–Baylis–Hillman acetates of nitroalkenes
作者:Divya K. Nair、Rubem F. S. Menna-Barreto、Eufrânio N. da Silva Júnior、Shaikh M. Mobin、Irishi N. N. Namboothiri
DOI:10.1039/c4cc02279c
日期:——
Cascade reactions of 1,3-dicarbonyls with Morita-Baylis-Hillman acetates of nitroalkenes using a quinine derived chiral squaramide organocatalyst led to the formation of pyranones and pyranonaphthoquinones in good to excellent yields and high diastereo- and enantioselectivities. Representative examples of the reaction scale-up with a much lower catalyst loading without an appreciable loss of selectivities
Base and catalyst-free synthesis of nitrobenzodiazepines via a cascade N-nitroallylation-intramolecular aza-Michael addition involving o-phenylenediamines and nitroallylic acetates
作者:Divya K. Nair、Sudheesh T. Sivanandan、Pravin Kendrekar、Irishi N.N. Namboothiri