A NEW SYNTHESIS OF XANTHONES - 2,4,7-TRICHLORONORLICHEXANTHONE AND 4,5,7-TRICHLORONORLICHEXANTHONE, 2 NEW LICHEN XANTHONES
A NEW SYNTHESIS OF XANTHONES - 2,4,7-TRICHLORONORLICHEXANTHONE AND 4,5,7-TRICHLORONORLICHEXANTHONE, 2 NEW LICHEN XANTHONES
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DOI：
10.1071/ch9901745
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发表时间：
1990-01-01
影响因子：
1.1
通讯作者：
WARDLAW, JH
中科院分区：
文献类型：
--
作者：
ELIX, JA;JIANG, H;WARDLAW, JH
A new synthetic route to norlichexanthone (1,3,6-trihydroxy-8-methyl-9H-xanthen-9-one) derivatives has been developed by using a Smiles rearrangement of an appropriately substituted depside in the key step. 2,4,7-Trichloronorlichexanthone (22) and 4,5,7-trichloronorlichexanthone (29) have been prepared by this method. The former xanthone (22) was shown to be a constituent of the lichens Lecanora sulphurata and L. flavo-pallescens and the latter (29) a constituent of Micarea austroternaria var. isabellina.
