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Some new triterpenoids from leaves of betula costata trautv.

✍ Scribed by N.I. Uvarova; G.V. Malinovskaya; G.B. Elyakov

Publisher: Elsevier Science
Year: 1976
Tongue: French
Weight: 241 KB
Volume: 17
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(00)93946-7

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✦ Synopsis

In investigating the unsaponifiable fraction of the ether extract from leaves of Betulq costatg Zrautv., we isolated triterpenes A, B, C and D, Triterpene A (I), C3#T2"3, m.p. 'l40-142°C (petroleum ether),[d]]+4.80 (c 0.5; CHCZ3), hydroxyl absorption in the IR spectrum (CHC13) was observed at 3560 and 3620 cm -,I . Proton signals of eight tertiary methyl groups were detected in the PMR spectrum at 6 (p.p.m.1: 0.77 (31i, s>, 0.88 (3H, S>, 0.9 (3X, s>, 1.0 (JR, s>, I.?1 (3H, s), 1.57 (3H, s>, 1.63 (3H, s>; a vinylic proton signal was also detected at C-24, 5.09 (IH, t) along with a proton signal at C-3, 3.32 CIH, t, J<4 Hz). The value of the constant J<4 Rz is indicative of an d -con91 duration of the OB group at C-3. In the 13C-N@lR spectrum of I, three carbon atom signals associated with

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