中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 6-(butylsulfanyl-methylene)-2,2-dimethyl-cyclohexanone | 67218-06-8 | C13H22OS | 226.383 |
The total synthesis of (±)-4-demethylaristolone (14) and its epimer, (±)-5-epi-4-demethylaristolone (15) is described. The key step of this synthesis involves the intramolecular cyclization of the olefinic diazoketone 12, which produces the two epimers, 14 and 15, in a ratio of approximately 2:1, respectively. The stereochemistry of the two epimers is unambiguously determined. It is observed that the lithium–ammonia reduction of 14 gives a dihydro derivative 16 containing trans-fused six-membered rings, while, interestingly, a similar reduction of 15 affords the corresponding cis-fused decalone system 26.