A Remarkable Accelerating Effect of Ag-Salt on Intramolecular Cyclization of o-(1-Alkynyl)benzenesulfonamides
摘要:
Herein, we report transition metal-catalyzed intramolecular cyclization of o-(1-alkynyl)benzenesulfonamides to afford 3-substituted benzothiazines regioselectively via a C-N bond forming reaction and Cu-catalyzed sequential C-N and C-C bond formation leading to the corresponding 3,4-disubstituted derivatives.
A Remarkable Accelerating Effect of Ag-Salt on Intramolecular Cyclization of o-(1-Alkynyl)benzenesulfonamides
摘要:
Herein, we report transition metal-catalyzed intramolecular cyclization of o-(1-alkynyl)benzenesulfonamides to afford 3-substituted benzothiazines regioselectively via a C-N bond forming reaction and Cu-catalyzed sequential C-N and C-C bond formation leading to the corresponding 3,4-disubstituted derivatives.
A Remarkable Accelerating Effect of Ag-Salt on Intramolecular Cyclization of <i>o</i>-(1-Alkynyl)benzenesulfonamides
作者:Deepak Kumar Barange、T. C. Nishad、N. Kumara Swamy、Venkanna Bandameedi、Dinesh Kumar、Bukkapattanam R. Sreekanth、K. Vyas、Manojit Pal
DOI:10.1021/jo701470h
日期:2007.10.1
Herein, we report transition metal-catalyzed intramolecular cyclization of o-(1-alkynyl)benzenesulfonamides to afford 3-substituted benzothiazines regioselectively via a C-N bond forming reaction and Cu-catalyzed sequential C-N and C-C bond formation leading to the corresponding 3,4-disubstituted derivatives.
AgNO3 mediated C–N bond forming reaction: synthesis of 3-substituted benzothiazines as potential COX inhibitors
作者:D. Rambabu、P.V.N.S. Murthy、K.R.S. Prasad、Ajit Kandale、Girdhar Singh Deora、M.V. Basaveswara Rao、Manojit Pal
DOI:10.1016/j.tetlet.2012.09.102
日期:2012.11
AgNO3 facilitated the intramolecular ring closure of o-(1-alkynyl)benzenesulfonamides via a regioselective C-N bond forming reaction leading to the formation of 3-substituted benzothiazine derivatives. A number of compounds were prepared in good yields by using this inexpensive and safe methodology. All the compounds synthesized were evaluated for their cyclooxygenase (COX) inhibiting properties in vitro. A number of compounds that do not contain an enolic hydroxyl group showed selectivities toward COX-2 over COX-1 inhibition. This was further supported by the predictive binding mode of two compounds with COX-1 and -2 proteins through molecular docking studies. (C) 2012 Elsevier Ltd. All rights reserved.