The wood of Platycarya strobilacea Sieb. et Zucc. (Juglandaceae) was used as incense. In this study, three new sesquiterpenes (2, 4, 5) and one nor-sesquiterpene (3) were isolated and their structures determined as 7-hydroperoxy-11-hydroxy-2,4-cycloeudesman-8-one (2), 8-hydroxy-13-nor-2,4-cycloeudesman-7-en-11-one (3), 2,4-cycloeudesma-7(11), 8-dien-(12,8)-olide (4), and 8-hydroxy-8,12-peroxy-2,4-cycloeudesm-7(11)-ene (5). In addition, the absolute configuration of a previously reported sesquiterpene was revised based on the calculation of its ECD spectrum.
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2.
TanakaT, JiangZ, KounoI. (1998) Distribution of ellagic acid derivatives and a diarylheptanoid in wood of Platycarya strobolacea. Phytochemistry, 47, 851–854.
3.
TanakaT, KounoI. (1996) Whisky lactone precursors from the wood of Platycarya strobilacea. Journal of Natural Products, 59, 997–999.
4.
MaedaH, KakokiN, AyabeM, KogaY, OribeT, MatsuoY, TanakaT, KounoI. (2011) ent-Eudesmane sesquiterpenoids, galloyl esters of the oak lactone precursor, and a 3-O-methylellagic acid glycoside from the wood of Platycarya strobilacea. Phytochemistry, 72, 796–803.
5.
PereiraAQ, ChavesFCM, PintoSC, LeitaoSG, BizzoHR. (2011) Isolation and identification of cis-7-hydroxycalamenene from the essential oil of Croton cajucara Benth. Journal of Essential Oil Research, 23, 20–23.
6.
NugrohoAE, MoritaH. (2014) Circular dichroism calculation for natural products. Journal of Natural Medicines, 68, 1–10
7.
LiXC, FerreiraD, DingY. (2010) Determination of absolute configuration of natural products: Theoretical calculation of electronic circular dichroism as a tool. Current Organic Chemistry, 14, 1678–1697.
