期刊
TETRAHEDRON LETTERS
卷 52, 期 41, 页码 5297-5300出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2011.08.004
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资金
- U.S. Department of Education, Tennessee State University
A series of substituted dibenzalacetones prepared using standard procedures were condensed with 5-methyl, 5-phenyl, and 5-trifluoromethyl-1,3-cyclohexanediones respectively, in toluene containing BF3.OEt as the Lewis acid catalyst. The reaction was found to be highly diastereoselective (dr, 9:1). The resulting spiroketals 1a-r were formed in moderate to good yields. In addition, a synthetically and biologically useful by-product identified as chromenone 7 was observed. Published by Elsevier Ltd.
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