| abstract |
A novel open-chain terpene compound useful as an intermediate for sarcophytol A having a resistance to a carcinogenesis and an antitumor activity and represented by general formula (I), wherein R?1 is a hydrogen atom, a 1-alkoxyalkyl group, a tetrahydrofuryl group, a tetrahydropyranyl group or an acyl group, R?2 is -CHO, -CH2?OR?3 or (a), wherein R?3 is a hydrogen atom, a 1-alkoxyalkyl group, a tetrahydrofuryl group, a tetrahydropyranyl group or an acyl group, R?4 is an alkyl group having 1 to 4 carbon atoms, provided that R?1 and R?3 are not simultaneously the same substituents and, when R?1 is a hydrogen atom, R?3 is neither an acetyl group nor a tetrahydropyranyl group and, when R?2 is a group represented by formula (a), R?1 is not a hydrogen atom. |