期刊
TETRAHEDRON LETTERS
卷 48, 期 46, 页码 8200-8204出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2007.09.080
关键词
indoles; phytoalexins; menthol; diastereoselectivity
Stereoselective synthesis of cruciferous indole phytoalexin (R)-(+)-1-methoxyspirobrassinin and its unnatural (S)-(-)-enantiomer was achieved by spirocyclization of 1-methoxybrassinin in the presence of (+)- and (-)-menthol and subsequent oxidation of the obtained menthyl ethers. Methanolysis of menthyl ethers in the presence of TFA afforded (2R,3R)-(-)-1-methoxyspirobrassinol methyl ether as well its unnatural (2S,3S)-, (2R,3S)-, and (2S,3R)-isomers. (C) 2007 Elsevier Ltd. All rights reserved.
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