Total Synthesis of 3-Hydroxydrimanes Mediated by Titanocene(<scp>III</scp>) - Evaluation of Their Antifeedant Activity
作者:José Justicia、J. Enrique Oltra、Alejandro F. Barrero、Ana Guadaño、Azucena González-Coloma、Juan M. Cuerva
DOI:10.1002/ejoc.200400634
日期:2005.2
the first synthesis of 3β-hydroxydihydroconfertifolin (3) and 3β-hydroxycinnamolide (4), together with improved procedures for the preparation of other 3-hydroxydrimanes (2 and 5) scarce in nature. The key step was the titanocene(III)-promoted cyclization of epoxypolyprenes, readily prepared from commercial polyenes. In this way, we confirm the viability of our procedure for the synthesis of drimane
Total synthesis of drimane sesquiterpenes from S-(+)-carvone (part 5)
作者:Henk J. Swarts、Anja A. Verstegen-Haaksma、Ben J.M. Jansen、Aede de Groot
DOI:10.1016/s0040-4020(01)89624-1
日期:1994.1
Conjugateaddition of potassium cyanide to S-(+)-carvone followed by annulation with methylvinylketone nitrile 4 in high yield. Methylation of 4, removal of the isopropenyl group and the introduction of C-12 via formylation then gave the unsaturated keto lactone 21 which is an excellent intermediate in the total synthesis of drimane sesquiterpenes. This was demonstrated with the total synthesis of