期刊
TETRAHEDRON LETTERS
卷 50, 期 31, 页码 4558-4562出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2009.05.095
关键词
Alkaloids; Oxoprotoberberine; Radical-initiated cyclization
资金
- National Science Council, ROC
The oxoprotoberberine alkaloids 1a-d have been synthesized efficiently from the enamide derivatives 2a-d by a radical-initiated cyclization reaction utilizing n-Bu3SnH/AIBN and CuCl. The enamide derivatives 2a-d were prepared from phenylethylamine analogues 5a-b, followed by acylation with acetic anhydride, Bischler-Napieralski cyclization with POCl3 and benzoylation with the corresponding bromobenzoyl chloride, respectively. (C) 2009 Elsevier Ltd. All rights reserved.
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