The racemate and both enantiomers of patchouli alcohol have been synthesized by stereocontrolled routes. The olfactive properties of the patchouli alcohols prepared are reported.
A totalsynthesis of rac-patchouli alcohol (1) was achieved in six steps starting from 2,2,6-trimethylcyclohexadiene (2) using a vinyl radical cyclization strategy.
A Short Synthesis of 3-Methyl-5-(2,3,6-trimethylphenyl)-1-penten-3-ol, a Sesquiterpene Isolated fromLaurencia Nidifica
作者:Wolfgang Oppolzer、Paul H. Briner、Roger L. Snowden
DOI:10.1002/hlca.19800630425
日期:1980.6.6
The racemic sesquiterpenoid alcohol 7 was synthesized in four steps (27% overall yield) from the cyclohexadienone 1. The key steps are the regioselective addition of the pentadienyllithium 2 to 1 and the Lewis-acid induced aromatization 4 6.
The photochemical behavior of tricyclo [5. 2. 2. 02, 6] undeca-3, 10-dien-9-one ring system (4), which was prepared by Diels-Alder reaction of cyclohexadienone derivatives and cyclopentadiene, has been studied under triplet sensitization and direct irradiation. In the triplet state, this ring system undergoes the oxa-di-π-methane (ODPM) rearrangement, while the 1, 3-acyl migration occurs from the singlet state. The triplet energy was estimated to be between 70 and 72 kcal/mol on the basis of sensitization by various sensitizers.