A Facile One Pot Synthesis of 2-Aryl-4-[2H-2-oxo-[1]benzopyran-3-yl] 2,3-dihydro and 2,5-Dihydro-1,5-benzothiazepines
作者:V. Rajeswar Rao、M. Madan Mohan Reddy
DOI:10.1080/104265091001326
日期:2006.2
3-acetyl coumarins on condensation with various aromatic aldehydes in the presence of piperidine gave corresponding chalcones in a solid state under solvent free conditions. These chalcones are isolated and characterized. The in-situ-formed chalcones (1) are also converted into corresponding 2-aryl-4-[2H-2oxo[1]benzopyran-3-yl]-2,3-dihydro (3) and 2,5-dihydro-1,5-benzothiazepines (4) in one step by interacting with orthoamino thiophenol. Both the 2,3-dihydro (3) and 2,5-dihydrobenzothiazepines ( 4) have been converted into same tetrahydrobenzothiazepine (5). Finally, the tetrahydrobenzo thiazepine (5) is converted into its acetyl derivative (11). The structures of the title compounds have been confirmed on the basis of their microanalytical, IR, H-1 NMR, and mass spectral data.
The effects of bromine atoms on the photophysical and photochemical properties of 3-cinnamoylcoumarin derivatives
作者:Zhiyuan Sun、Yu Wang、De-Cai Fang、Yuxia Zhao
DOI:10.1039/c8nj00966j
日期:——
difference was found in their photochemicalproperties compared to T1 without modification. In contrast, T6 and T7 with one bromine linked onto the right benzenering (mainly in the HOMO) exhibited enhanced capability of generating singlet oxygen and decreased photostability caused by the transformation between their two conformers, while T8 with two bromines on the benzenering was photobleached rapidly