Stereospecific Synthesis of 3-Oxo-α-bourbonene and the Cisoid Isomer for Structural Determination of the Toxic Component of<i>Lansium domesticum</i>
作者:Tadao Uyehara、Ichiro Suzuki、Yoshinori Yamamoto
DOI:10.1246/bcsj.61.2672
日期:1988.7
The cis-cisoid-cis isomer of 3-oxo-α-bourbonene, (1), the original structure proposed for the toxic principle of Lansium domesticum, has been prepared from (−)-mintsulfide. Neither spectral data of 1 nor of 3-oxo-α-bourbonene itself, derived from β-bourbonene, are not identical with those of the toxic componet.
Tomioka, Kiyoshi; Tanaka, Masahide; Koga, Kenji, Chemical and pharmaceutical bulletin, 1989, vol. 37, # 5, p. 1201 - 1207
作者:Tomioka, Kiyoshi、Tanaka, Masahide、Koga, Kenji
DOI:——
日期:——
A short enantiospecific route to isodaucane sesquiterpenes from limonene. On the absolute configuration of (+)-aphanamol I and II.
作者:Thomas Hansson、Boerje Wickberg
DOI:10.1021/jo00046a018
日期:1992.9
The isodaucane sesquiterpenes (+)-aphanamol I (3) and (-)-2-oxoisodauc-5-en-12-al [(-)-6] have been prepared in a short reaction sequence from 5(S)-isopropyl-2-methyl-l-cyclopentene-1-carbaldehyde (S)-23 (readily obtainable from (+)-limonene). Key steps were a de Mayo type photocyclization of an 3-acyloxy-2-cyclopenten-1-one with 3(S)-isopropyl-1-methylcyclopentene [(S)-24] to a [5.3.0.0(2.6)]tricyclodecanone (e.g., (-)-28) with the desired configuration at all stereocenters and the formation of 3 by a base-catalyzed fragmentation of the gamma,delta-epoxyalcohol intermediate 33 (R = H), which produced all the desired functional groups in one step. The stereochemical assignments were supported by CD data as well as by the synthesis of (-)-norbourbonone (29) from (S)-24, which is a novel chiral intermediate. These results are in confliction with some earlier assignmnents of the absolute configuration in the isodaucane group of sesquiterpenes.
The structure and absolute configuration of α- and β-bourbonene, sesquiterpenic hydrocarbons from the essential oil of geranium bourbon
作者:J. Křepinský、Z. Samek、F. Šorm、D. Lamparsky、. Ochsner、Y.-R. Naves
DOI:10.1016/s0040-4020(01)82169-4
日期:1966.1
TOMIOKA, KIYOSHI;TANAKA, MASAHIDE;KOGA, KENJI, CHEM. AND PHARM. BULL., 37,(1989) N, C. 1201-1207