中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 2-(2'-benzyloxy-5'-carboxy-4'-hydroxy-6'-propyphenoxy)-4-methoxy-6-propylbenzoic acid | 113487-83-5 | C28H30O8 | 494.541 |
—— | 2-(5'-carboxy-2',4'-dihydro-6'-propylphenoxy)-4-methoxy-6-propylbenzoic acid | 113487-84-6 | C21H24O8 | 404.417 |
—— | methyl 4-benzyloxy-2,5-dihydroxy-6-propylbenzoate | 113487-77-7 | C18H20O5 | 316.354 |
The depsidones divaronic acid (24) (8-hydroxy-3-methoxy-1,6-dipropyl-11- oxo -11H- dibenzo [ b,e ][1,4]dioxepin-7-carboxylic acid) and stenosporonic acid (25) (8-hydroxy-3-methoxy-6-pentyl-l-propyl-ll-oxo-l1H-dibenzo[ b,e ][1,4]dioxepin-7-carboxylic acid) have been prepared by unambiguous synthesis, and have been shown to cooccur with colensoic acid, atranorin and chloroatranorin in the lichen Paraparmelia mongaensis. The syntheses employed a novel biomimetic-type approach which involved a Smiles rearrangement of a precursor meta-depside in the key step. This rearrangement has important biosynthetic implications and may account for the natural occurrence of isostructural depside-depsidone pairs.