The Biotransformation of Some Clovanes by Botrytis cinerea
摘要:
The metabolism of the fungistatic agent 2 beta-methoxyclovan-9 alpha-ol (2) by the fungus Botrytis cinerea has been investigated. Biotransformation of compound 2 yielded compounds 3-5, 7, and 9. The major metabolites of compound 2 each show much reduced biological activity when compared with the parent compound. Also studied were the effects of B. cinerea on the metabolism of the related compounds 2 beta-methoxyclovan-9-one (3), 2 beta-methoxyclovan-9 beta-ol (4), and clovan-2,9-dione (6). Compounds 3, 4, 8, and 9 are described for the first time.
The asymmetric total synthesis of clovan-2,9-dione with a [6.3.1.01,5]dodecane skeleton has been achieved. The synthesis features a Rh(I)-catalyzed [3 + 2 + 1] cycloaddition of 1-yne-vinylcyclopropane (1-yne-VCP) with CO and an intramolecular aldol reaction to obtain the skeleton of the target molecule.