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TETRAHEDRON LETTERS
卷 42, 期 9, 页码 1647-1649出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4039(00)02341-8
关键词
sodium bromate; sodium hydrogen sulfite; hypobromous acid; intramolecular nucleophilic substitution; phthalide and derivatives
o-Alkylbenzenecarboxylic acids are treated with a sodium bromate and sodium hydrogen sulfite reagent under a two-phase system using ethyl acetate as solvent, under mild conditions to give the corresponding cyclized phthalides in moderate to satisfactory yield. Intermediately the a-brominated alkylbenzenecarboxylic acids are formed by the in situ generated hypobromous acid. These alpha -brominated acids undergo an intramolecular nucleophilic substitution reaction to afford the corresponding gamma -lactones. (C) 2001 Published by Elsevier Science Ltd.
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