期刊
TETRAHEDRON
卷 60, 期 38, 页码 8445-8454出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2004.07.003
关键词
3-alkoxy-2-styrylchromones; type II cyclisations; 1,4-and 1,6-biradicals
3-Alkoxy-2-styrylchromones on photo-irradiation with UV-light transform into oxetanopyrananones, pyranopyrones, pyranopyrananones and pyranoalcohols. The products formed have been found to depend upon the structure of alkoxy group (methyl, benzyl and allyls). Alkoxychromones containing a heterocyclic ring (thiophene, furan) in place of phenyl in the styryl group produced only pyranoalcohols as the photoproducts. The photo-conversions have been rationalized through an initial H-abstraction by the C=O group producing a 1,4-biradical. In allyloxy derivatives, cyclisations involve both 1,4- and 1,6-biradicals. (C) 2004 Elsevier Ltd. All rights reserved.
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