中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | O-acetyltrisnorcybrodolide | 74973-58-3 | C14H16O4 | 248.279 |
—— | methyl 3-(2-hydroxyethyl)-6-methoxymethyl-2,4-dimethylbenzoate | 79801-58-4 | C14H20O4 | 252.31 |
—— | methyl 3-(2-acetoxyethyl)-6-methoxymethyl-2,4-dimethylbenzoate | 74973-60-7 | C16H22O5 | 294.348 |
—— | methyl 3-(2-(tetrahydro-2H-pyran-2-yl)oxyethyl)-6-methyoxymethyl-2,4-dimethylbenzoate | 74973-59-4 | C19H28O5 | 336.428 |
—— | 2-(4-methoxymethyl-2,6-dimethylphenyl)ethanol | 74973-56-1 | C12H18O2 | 194.274 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | O-acetyltrisnorcybrodolide | 74973-58-3 | C14H16O4 | 248.279 |
—— | 6-formyl-5,7-dimethylphthalide | 79801-77-7 | C11H10O3 | 190.199 |
—— | 6-vinyl-5,7-dimethylphthalide | 79801-76-6 | C12H12O2 | 188.226 |
—— | 6-<2-(4-nitrophenylseleno)ethyl>-5,7-dimethylphthalide | 916309-49-4 | C18H17NO4Se | 390.297 |
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.
The isolation and structure determination of the "cybrodins", a new group of sesquiterpenoids produced by a new strain of the bird's nest fungus Cyathus bulleri, is reported. Cybrodol (3), isocybrodol (4), cybrodal (5), trisnorcybrodolide (6), and cybrodic acid (7) may be classified as seco-illudalane sesquiterpenes. The evidence leading to the structural assignments is presented, along with chemical correlations among the cybrodins. The possible mode of biogenesis is discussed. Pterosin-C (13), a known norsesquiterpene, and 3-methyllumichrome (17) were also isolated. Small quantities of a new sesquiterpenoid, broderol, believed to possess structure 21, were obtained on two occasions.