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Then, an ester of amino acid (12mmol) in DCM was added, and stirring continued for further 2\u20133h and TLC analysis was carried to determine the completion of the coupling. After a simple acid base workup, N\u03b1-protected peptide esters were isolated in above 85% yield. As and when necessary, the crude products were subjected to column chromatography using varying concentrations of EtOAc:hexane as an eluant. The pure products were obtained after the evaporation of solvent under vacuo."}],"container-title":["Ultrasonics Sonochemistry"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S1350417708000722?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S1350417708000722?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2024,10,11]],"date-time":"2024-10-11T01:39:01Z","timestamp":1728610741000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/S1350417708000722"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2008,9]]},"references-count":24,"journal-issue":{"issue":"6","published-print":{"date-parts":[[2008,9]]}},"alternative-id":["S1350417708000722"],"URL":"https:\/\/doi.org\/10.1016\/j.ultsonch.2008.04.009","relation":{},"ISSN":["1350-4177"],"issn-type":[{"type":"print","value":"1350-4177"}],"subject":[],"published":{"date-parts":[[2008,9]]},"assertion":[{"value":"Elsevier","name":"publisher","label":"This article is maintained by"},{"value":"Ultrasound accelerated conversion of N\u03b1-urethane protected peptide esters to their thiopeptides using P2S5","name":"articletitle","label":"Article Title"},{"value":"Ultrasonics Sonochemistry","name":"journaltitle","label":"Journal Title"},{"value":"https:\/\/doi.org\/10.1016\/j.ultsonch.2008.04.009","name":"articlelink","label":"CrossRef DOI link to publisher maintained version"},{"value":"article","name":"content_type","label":"Content Type"},{"value":"Copyright \u00a9 2008 Elsevier B.V. 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