Dehydracetic acid difluoroborane complex, 3-acetyl-6-methyl-2-oxo-2H-pyran-4-yl difluoridoborate, was synthesized and characterized. The complex was involved into condensation reactions at the acetyl group with various aromatic and heterocyclic aldehydes, and with the 4-dimethylaminobenzaldehyde it reacted also at the methyl group in the position 6.
Benzodiazepines (BZDs) represent a class of privilege scaffold in the modern era of medicinal chemistry as CNSactiveagents and BZD based drugs are used to treat different psychotic disorders. Inspired from the therapeutic potential of BZDs as promising CNSactiveagents, in the present work three different series of 1,5-benzodiazepines bearing various substitutions at position 2 and 4 of the benzodiazepine
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).
quantum chemical analysis of the stability of tautomers of cinnamoyl pyrone derivatives and vinylogs has been studied. The relationship between the structure of the most stable tautomer and its spectral properties has been investigated. It has been determined that the tautomer of highest stability (88–100 molar %) has an α-pyrone structure and exhibits a trans-conformation in the cinnamoyl fragment. An
group exhibited the strongest ARE inductive activity in the first round structure–activity relationship (SAR) study. Biological studies showed the compound induced nuclear translocation of Nrf2 preceded by phosphorylation of ERK1/2. The data encouraged us to use 2 as lead and 20 derivatives were synthesized to discuss a more detailed SAR, leading to a more potent compound 9, which can be the starting