synthesised from (1)-menthone by the reaction sequence-hydroxyformylation, C-methylation, Wittig-olefination and addition of lithium acetylide to CO. The concerted thermally allowed oxy-Cope rearrangement of the opticallyactive substrate 4 is reported.
The sesquiterpene–coumarinether samarcandone provided a suitable framework to replace the apocarotenoid A–C ring system of strigol (1), replicating, after linking to a butenolide moiety, the activity of the natural phytohormone on Nrf2 and also showing potent NF-kB inhibitory activity, overall modulating two critical pathways of inflammation and cancer.
Leptosperols A and B, Two Cinnamoylphloroglucinol–Sesquiterpenoid Hybrids from <i>Leptospermum scoparium</i>: Structural Elucidation and Biomimetic Synthesis
Compounds 1 and 2 represent the first example of phloroglucinol derivatives biogenetically constructed by a De Mayo reaction. The biomimetic synthesis of leptosperol B (2) was achieved using the proposed biosynthetic pathway. In addition, compounds 1 and 2 showed significant anti-inflammatory effects in zebrafish acute inflammatory models.
Thieme Chemistry Journal Awardees - Where Are They Now? Synthesis of (-)-Cubebol by Intramolecular Cyclopropanation of a Terminal Epoxide
作者:David Hodgson、Saifullah Salik
DOI:10.1055/s-0029-1217353
日期:2009.7
A synthesis of (―)-cubebol from l-menthone is described. The key step involves efficient (90%) and completely stereocontrolled intramolecular cyclopropanation of an unsaturated α-lithiated terminal epoxide.