中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 1-((3-(2-(terahydro-2H-pyran-2-yl)oxyethyl)-6-methoxymethyl-2,4-dimethyl)phenyl)-2-butyn-1-ol | 79801-61-9 | C21H30O4 | 346.467 |
The total syntheses of cybrodol (1), isocybrodol (2), cybrodal (3), cybrodic acid (4), and trisnorcybrodolide (5), starting from 2-bromomesitylene (6) are described. The route involves oxidation of the 5-methyl group of 6 by means of chromyl acetate, addition of the β-hydroxyethyl chain by aryllithiation and reaction with ethylene oxide, and addition of the fifth carbon substituent by aryllithiation and treatment with ethyl chloroformate to give the key intermediate, methyl 3-(2-hydroxyethyl)-6-methoxymethyl-2,4-dimethylbenzoate (18d). The latter was transformed into trisnorcybrodolide (5), and further elaborated via the corresponding aldehyde 21 into the remaining cybrodins.