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.
Transannular cyclisation as a stratagem in synthesis. A total synthesis of (±)-pentalenene
作者:Gerald Pattenden、Simon J. Teague
DOI:10.1016/s0040-4020(01)87743-7
日期:1987.1
A total synthesis of the triquinane sesquiterpene (±)-pentalenene(1) found in Streptomyces, based on transannularcyclisation of the bicyclo [6.3.0] undecadiene (7) in the presence of boron trifluoride etherate is described. The bicyclo(6.3.0]undecadiene(7) was elaborated from the silyl enol ether(36) using a unique intramolecular [2+2] photocycloaddition - Grob fragmentation sequence leading to (8)
A totalsynthesis of (±)-pentalenene (1), based on transannulation of the bicyclo[6.3.0] undecadiene (15) in the presence of boron trifluoride etherate, is described.
Intramolecular photocycloadditions-cyclobutane fragmentation: total synthesis of (.+-.)-pentalenene, (.+-.)-pentalenic acid, and (.+-.)-deoxypentalenic acid
作者:Michael T. Crimmins、Joe A. DeLoach
DOI:10.1021/ja00264a037
日期:1986.2
Pentalenene, pentalenic acid, and deoxypentalenicacid, important metabolites in the biosynthesis of the pentalenolactones, have been synthesized from methyl isobutyrate through a common intermediate. The initial key step involves a novel conjugate addition-cycloacylation sequence on an acetylenic diester. The 1,6-diene which results is converted in two steps to a 1,6-diene diester which undergoes
A new synthesis of pentalenene using a novel tandem cyclisation involving ketene radical intermediates
作者:Nicole M Harrington-Frost、Gerald Pattenden
DOI:10.1016/s0040-4039(99)02070-5
日期:2000.1
A new approach to the synthesis of the angular triquinane (±)-pentalenene, based on sequential 5-exo-trig and 5-exo-dig radicalcyclisations involving ketene intermediates produced from an α,β-unsaturated acyl radical precursor, is described.