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Conversely, sequential one-pot coupling with guanidine in the presence of Cs2CO3, followed by PIDA-mediated oxidative cyclization, delivers 3-amino-1,2,4-oxadiazoles. Both protocols tolerate diverse functional groups, and the oxadiazole synthesis enables late-stage derivatization of probenecid, adapalene, and ataluren. Control experiments suggest that hydrazine reacts primarily through a bis(acyloxy)methane intermediate, whereas guanidine can engage both bis(acyloxy)methane and acyloxymethyl chloride intermediates. These results demonstrate that CH2Cl2-mediated carboxylic acid activation constitutes a programmable coupling platform wherein the identity of the nitrogen nucleophile governs the reaction pathway.<\/jats:p>","DOI":"10.1021\/acs.orglett.6c03512","type":"journal-article","created":{"date-parts":[[2026,9,15]],"date-time":"2026-09-15T07:01:41Z","timestamp":1789455701000},"page":"12389-12394","source":"Crossref","is-referenced-by-count":0,"title":["Nucleophile-Directed\nDichloromethane-Mediated Coupling\nof Carboxylic Acids for Access to Acyl Hydrazides and 3-Amino-1,2,4-Oxadiazoles"],"prefix":"10.1021","volume":"28","author":[{"given":"Nithin","family":"Pootheri","sequence":"first","affiliation":[{"name":"Chonnam National University , , ,","place":["Jeonnam-Gwangju, Republic of Korea, 61186"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5079-3860","authenticated-orcid":true,"given":"Sunwoo","family":"Lee","sequence":"additional","affiliation":[{"name":"Chonnam National University , , ,","place":["Jeonnam-Gwangju, Republic of Korea, 61186"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,15]]},"reference":[{"key":"2026100208372185100_cit1a","doi-asserted-by":"publisher","first-page":"569","DOI":"10.2174\/092986712798918789","article-title":"A Review on Biological\nActivities and Chemical Synthesis of Hydrazide Derivatives","volume":"19","author":"Narang","year":"2012","journal-title":"Curr. 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