Absolute Stereochemistry of Tanabalin, an Insect Antifeedant Clerodane fromTanacetum balsamita
摘要:
The absolute structure of tanabalin (= 12S-acetoxyhautriwaic acid), an insect antifeedant isolated from Tanacetum balsamita, was determined by X-ray crystallography together with modified Mosher’s method, in which an anomalous Δδ value of a proton was verified with an l-adrenaline derivative as a model compound.
Tandem intermolecular alkylation-intramolecular Robinson annelation: A novel and stereoselective construction of the octalin skeleton —Expeditious synthesis of (−)-tanabalin -
Tanabalin (1), an insect antifeedant, was synthesized in optically active form employing a known δ-lactone (F) as the only source of chirality. The key step is a tandem intermolecular alkylation-intramolecular Robinson annelation to construct the trans-octalin skeleton.
The absolute structure of tanabalin (= 12S-acetoxyhautriwaic acid), an insect antifeedant isolated from Tanacetum balsamita, was determined by X-ray crystallography together with modified Mosher’s method, in which an anomalous Δδ value of a proton was verified with an l-adrenaline derivative as a model compound.