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Note | Regular issue | Vol 75, No. 6, 2008, pp.1447-1455
Published online, 15th February, 2008
DOI: 10.3987/COM-07-11291
Three New ent-Kaurane Diterpenoids from the Seeds of Pharbitis nil

Ki Hyun Kim, Mi Rim Jin, Sang Zin Choi, Mi Won Son, and Kang Ro Lee*

*Natural Products Laboratory, College of Pharmacy, Sungkyunkwan University, Suwon 440-746, Korea

Abstract

Three new ent-kaurane diterpenoids, 7β, 16β, 17-trihydroxy ent-kauran 18-(6β)-olide (1), methyl 6β, 7β, 16β, 17-tetrahydroxy ent-kauran-18-oate (2) and 6β, 7β, 16β, 17-tetrahydroxy ent-kauran-18-oic acid (3), together with thirteen known compounds, were isolated from the seeds of Pharbitis nil (Convolvulaceae). The identification and structural elucidation of these compounds were based on 1D- and 2D-NMR spectral data analysis. The absolute configuration of 1 was determined by a convenient Mosher ester procedure carried out in NMR tube.