Turkish Journal of Chemistry
DOI
10.3906/kim-1410-64
Abstract
A series of 3-(9-hydroxy-3-methoxy-7-aryl-6,7,9,10-tetrahydro-5$H$-benzo[$h$]thiazolo[2,3-$b$]quinazolin-9-yl)-2$H$-chromen-2-ones (5a-j) were synthesized by one-pot multicomponent reaction of 6-methoxy-1-tetralone, aryl aldehydes, and thiourea followed by cyclization with 3-(2-bromoacetyl)-2$H$-chromen-2-one in the presence of a Bronsted solid acid catalyst, poly(4-vinylpyridinium)hydrogen sulfate [P(4-VPH)HSO$_{4}$] (0.015 g), under solvent-free conditions at 120 $^{\circ}$C. All the synthesized compounds were characterized by spectral studies and screened for their in vitro antibacterial activity against S. aureus and B. thuringiensis (gram positive), and E. coli and K. pneumoniae (gram negative) bacterial strains. On comparing with the standard drug gentamicin, compounds derived from 4-methoxy and 3,4,5-trimethoxy benzaldehyde, i.e. 5g and 5h, showed broad spectrum antibacterial activity and the remaining compounds showed weak to moderate activity.
Keywords
Quinazolinethiones, thiazoloquinazolines, poly(4-vinylpyridinium)hydrogen sulfate, one pot and solvent-free method, antibacterial activity
First Page
620
Last Page
629
Recommended Citation
VELPULA, RAVIBABU; BANOTHU, JANARDHAN; GALI, RAJITHA; SARGAM, YAKAIAH; and BAVANTULA, RAJITHA
(2015)
"One-pot and solvent-free synthesis of 3-(9-hydroxy-3-methoxy-7-aryl-6,7,9,10-tetrahydro-5$H$-benzo[$h$]thiazolo[2,3-$b$]quinazolin-9-yl)-2$H$-chromen-2-ones and their antibacterial evaluation,"
Turkish Journal of Chemistry: Vol. 39:
No.
3, Article 11.
https://doi.org/10.3906/kim-1410-64
Available at:
https://journals.tubitak.gov.tr/chem/vol39/iss3/11
