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Binding studies of such azaheterocycles with biomolecules is an important subject for pharmaceutical and biochemical studies aiming at the design and development of new drugs. Fused heterocyclic scaffolds, such as thiazolopyrmidines have long been used in the pharmaceutical industry for the treatment of various diseases. In this study, we have accomplished a regioselective synthesis of 2-aroyl-3-methyl-6,7-dihydro-5<jats:italic>H<\/jats:italic>-thiazolo[3,2-<jats:italic>a<\/jats:italic>]pyrimidines by the reaction of tetrahydropyrimidine-2(<jats:italic>H<\/jats:italic>)-thione with \u03b1-bromo-1,3-diketones, generated in situ from 1,3-diketones and NBS, using visible light as an inexpensive, green and renewable energy source under mild reaction conditions with wide-ranging substrate scope. The regioisomer was characterized unambiguously by 2D-NMR [<jats:sup>1<\/jats:sup>H-<jats:sup>13<\/jats:sup>C] HMBC and [<jats:sup>1<\/jats:sup>H-<jats:sup>13<\/jats:sup>C] HMQC spectroscopy. In silico toxicity data analysis showed the low toxicity risks of the synthesized compounds. Computational molecular docking studies were carried out to examine the interaction of thiazolo[3,2-<jats:italic>a<\/jats:italic>]pyrimidines with calf-thymus DNA (ct-DNA) and Bovine Serum Albumin (BSA). Moreover, different spectroscopic approaches viz<jats:italic>.<\/jats:italic> steady-state fluorescence, competitive displacement assay, UV\u2013visible and circular dichroism (CD) along with viscosity measurements were employed to investigate the binding mechanisms of thiazolo[3,2-<jats:italic>a<\/jats:italic>]pyrimidines with DNA and BSA. The results thus obtained revealed that thiazolo[3,2-<jats:italic>a<\/jats:italic>]pyrimidines offer groove bindings with DNA and showed moderate bindings with BSA.<\/jats:p>","DOI":"10.1038\/s41598-021-01037-4","type":"journal-article","created":{"date-parts":[[2021,11,11]],"date-time":"2021-11-11T11:06:09Z","timestamp":1636628769000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Visible-light driven regioselective synthesis, characterization and binding studies of 2-aroyl-3-methyl-6,7-dihydro-5H-thiazolo[3,2-a]pyrimidines with DNA and BSA using biophysical and computational techniques"],"prefix":"10.1038","volume":"11","author":[{"given":"Ranjana","family":"Aggarwal","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Naman","family":"Jain","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shilpa","family":"Sharma","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Prince","family":"Kumar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gyan Prakash","family":"Dubey","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Heerak","family":"Chugh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ramesh","family":"Chandra","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,11,11]]},"reference":[{"key":"1037_CR1","doi-asserted-by":"publisher","first-page":"266","DOI":"10.3998\/ark.5550190.0009.d29","volume":"13","author":"H Zhi","year":"2008","unstructured":"Zhi, H. et al. 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