Study of the reaction of chalcone analogs of dehydroacetic acid and o-aminothiophenol: synthesis and structure of 1,5-benzothiazepines and 1,4-benzothiazines
作者:Om Prakash、Ajay Kumar、Anil Sadana、Richa Prakash、Shiv P. Singh、Rosa M. Claramunt、Dionisia Sanz、Ibon Alkorta、José Elguero
DOI:10.1016/j.tet.2005.03.035
日期:2005.7
reaction of DHA and aromatic (or heteroaromatic) aldehydes, with o-aminothiophenol results in the formation of 1,5-benzothiazepines and/or 1,4-benzothiazines depending upon the reaction conditions and structure of the aldehydes. The products were characterized by the combined use of multinuclear 1D and 2D NMR and GIAO/DFT calculations of 1H, 13C and 15N chemical shifts. The tautomerism of these compounds
A FACILE SYNTHESIS OF 3,4-DIHYDRO- 2-PYRONYL-1,5-BENZODIAZEPINE DERIVATIVES
作者:Om Prakash、Ajay Kumar、Anil Sadana、Shiv P. Singh
DOI:10.1081/scc-120006030
日期:2002.1
ABSTRACT The reaction of o-phenylenediamine with 3-cinnamoyl-4-hydroxy-6-methyl-2-pyrones (3a–i, chalcone analogs of dehydroactic acid) in ethanol-acetic acid provides a facile method for the synthesis of 3,4-dihydro-2-pyronyl-1,5-benzodiazepine derivatives (2a–i).