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Photocatalytic generation of a carbon-centered radical, followed by addition to the vinyl azide and N2 extrusion, affords an iminyl radical that undergoes 1,6-HAT and cyclization. The reaction proceeds under mild conditions, exhibits broad substrate compatibility, and is amenable to gram-scale synthesis. Hydrogenation of the products provides highly substituted piperidines, demonstrating the synthetic utility of the method.<\/jats:p>","DOI":"10.1021\/acs.orglett.6c02806","type":"journal-article","created":{"date-parts":[[2026,8,4]],"date-time":"2026-08-04T13:17:07Z","timestamp":1785849427000},"page":"10051-10056","source":"Crossref","is-referenced-by-count":0,"title":["Photocatalytic 1,6-HAT-Enabled Formal [3 + 3] Annulation\nof Vinyl Azides with \u03b1-Bromomalonates to Tetrahydropyridines"],"prefix":"10.1021","volume":"28","author":[{"given":"Wen-Jun","family":"Li","sequence":"first","affiliation":[{"name":"Soochow University , , ,","place":["Suzhou, China, 215123"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Li-Fa","family":"Zhong","sequence":"additional","affiliation":[{"name":"Soochow University , , ,","place":["Suzhou, China, 215123"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1021-3942","authenticated-orcid":true,"given":"Limin","family":"Yang","sequence":"additional","affiliation":[{"name":"Hangzhou Normal University , , , ,","place":["Hangzhou, Zhejiang, P. 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