期刊
JOURNAL OF FLUORINE CHEMISTRY
卷 133, 期 -, 页码 171-177出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jfluchem.2011.10.011
关键词
Trifluoromethyl; Chromene; Chromones; Oxa-Michael-aldol
资金
- Special Fund for Agro-scientific Research in the Public Interest [201103007]
- National Key Technologies RD Program [2011BAE06B05]
- Shanghai Scientific Research Program [10XD1405200]
- National Basic Research Program of China [2010CB126103]
- National Natural Science Foundation of China [21032006]
- SIOC
A method for the preparation of methyl 4-hydroxy-2-(trifluoromethyl)-4H-chromenes-3-carboxylate derivatives 3a-j from readily available trifluoromethylated building block methyl (Z)-2-bromo-4,4,4-trifluoro-2-butenoate 1 was described. Treatment of 3a-j with Sarrett reagent in CH2Cl2 generated methyl 4-oxo-2-(trifluoromethyl)-chromene-3-carboxylate derivatives 4a-h with moderate to good yields, which can be converted to 2-trifluoromethyl-substituted multifunctional benzoxepins through cyclopropanation and Lewis acid-catalyzed ring opening. (C) 2011 Elsevier B.V. All rights reserved,
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