several chlorinated derivatives of norlichexanthone 6a by unambiguous methods are described. The 1H NMR spectra of these compounds are discussed and several structures previously assigned for lichenxanthones are questioned. The suggested revisions are summarized in Table 3.
描述了通过明确方法制备去甲己基己酮6a的几种氯化衍生物的方法。讨论了这些化合物的1 H NMR光谱,并对先前指定用于地衣chen吨的几种结构提出了质疑。表3总结了建议的修订。
Depsidone synthesis. Part 20. Lecideoidin and dechlorolecideoidin
作者:Peter M. McEwen、Melvyn V. Sargent
DOI:10.1039/p19810000883
日期:——
The synthesis of methyl 2,9-dichloro-3,8-dihydroxy-1,6-dimethyl-11-oxo-11H-dibenzo[b,e][1,4]dioxepin-7-carboxylate (lecideoidin)(1) and methyl 2-chloro-3,8-dihydroxy-1,6-dimethyl-11-oxo-11H-dibenzo[b,e][1,4]-dioxepin-7-carboxylate (dechlorolecideoidin)(2) by oxidation of benzophenones and subsequent steps is described.