A Short Synthesis of Aphanamol I in Both Racemic and Enantiopure Forms
作者:Steven J. Ferrara、Jonathan W. Burton
DOI:10.1002/chem.201602669
日期:2016.8.8
A short synthesis of the biologically active sesquiterpene natural product (+)‐aphanamol I in both racemic and enantiopure forms is reported. Key steps include: a catalytic enantioselective conjugate addition, an oxidative radical cyclization, and a ring‐expanding Claisen rearrangement.
报道了外消旋和对映体纯形式的生物活性倍半萜天然产物 (+)-aphanamol I 的简短合成。关键步骤包括:催化对映选择性共轭加成、氧化自由基环化和扩环克莱森重排。
Enantioselective approach to isodaucane sesquiterpenes. Total synthesis of (+)-aphanamol-I and (+)-2-oxo-isodauc-5-en-12-al
作者:Goverdhan Mehta、Nacharaju Krishnamurthy、Srinivas Rao Karra
DOI:10.1039/c39890001299
日期:——
A general approach to isodaucanesesquiterpenes from (R)-(+)-limonene, resulting in the totalsynthesis of (+)-aphanamol-I (3) and (+)-2-oxo-isodauc-5-en-12-al (5), is described.
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.
MEHTA, GOVERDHAN;KRISHNAMURTHY, NACHARAJU;KARRA, SRINIVAS RAO, J. CHEM. SOC. CHEM. COMMUN.,(1989) N8, C. 1299-1300