Bifunctional reagents in organic synthesis. Total syntheses of the sesquiterpenoids (±)-pentalenene and (±)-9-<i>epi</i>-pentalenene
作者:Edward Piers、Veranja Karunaratne
DOI:10.1139/v89-026
日期:1989.1.1
27 and 28 (42:58, respectively), which was transformed into a separable mixture of (±)-pentalenene (1) (32%) and (±)-9-epi-pentalenene (30) (33%). Keywords: ±-pentalenenesynthesis, ±-9-epi-pentalenene synthesis, sesquiterpenoidsynthesis, methylenecyclopentaneannulation, bifunctional reagents, triquinane synthesis.
Anionic Cyclization of N-(trans-2,3-Diphenylaziridin-1-yl)imines: Its Application to Sesquiterpene Synthesis via Consecutive Carbon-Carbon Bond-Formation Approach
作者:Sunggak Kim、Jung-Il Hwang
DOI:10.1055/s-0029-1219933
日期:2010.6
The anionic consecutive carbon-carbon (CC-C) bond formation can be achieved by the anioniccyclizations of N-(trans-2,3-diphenylaziridin-1-yl)imines with alkyllithiums. The synthetic efficiency of CC-C bond-formation approach has been demonstrated in the synthesis of dl-pentalenene and dl-cedrone.
Methylenecyclopentane annulation: a synthesis of the sesquiterpenoid (±)-pentalenene
作者:Edward Piers、Veranja Karunaratne
DOI:10.1039/c39840000959
日期:——
Transformation of the readily available keto acetal (10) into the novel sesquiterpenoid (±)-pentalenene (1) is accomplished via a 12-step synthetic sequence, the key conversion [(13) into (15)] of which involves a new, recently developed methylenecyclopentaneannulation process.
A stereoselective route to (±)-pentalenene and (±)-9-epi-pentalenene
作者:Yong-Jin Wu、D. Jean Burnell
DOI:10.1039/c39910000764
日期:——
The (±)-pentalenene 1 and (±)-epi-pentalenene 12 have been synthesised by a novel spiro-annulation strategy that allowed the subsequent formation of two of the five-membered rings by aldol condensations; the order of reduction of two double bonds in a bicyclic intermediate 8 led, in a Stereoselective manner, to one C-9 epimer or the other.
(±)-Pentalenene, the least oxidized triquinane sesquiterpene, was totally synthesized starting from 4, 4-dimethyl-2-cyclopenten-1-one via a regioselective C2-C8 bond opening of the tricyclo[3.3.0.02, 8]octan-3-one intermediate.