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).
von zwanzig 4‐Hydroxy‐3‐(1‐oxo‐2‐propenyl)‐2‐pyronen werden mit Hilfe der 1H‐NMR‐Spektroskopie bei 250 MHz untersucht. Bei 17 Substanzen kann Polymorphie nachgewiesen werden, wobei bis zu vier Modifikationen aufgefunden werden. Es werden überwiegend und mit fast gleicher Häufigkeit Dimere von δ‐Truxinsäuretyp (Kopf‐Kopf‐Addition) und vom α‐Truxillsäuretyp (Kopf‐Schwanz‐Addition) gebildet.
have the ability to exhibit a pronounced fluorescence response in the presence of amyloidfibrils of these proteins depending on the structure of the dye tail groups. The dyes associated with the fibrils show green-yellow emission (495–540 nm) and rather large Stokes shift values (68–125 nm). Upon binding to the fibrils, the fluorescence quantum yields of the dyes could increase by a hundred times up
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