α-Ketenyl radical intermediates in the synthesis of propellanes. A formal synthesis of modhephene
作者:Benoît De Boeck、Gerald Pattenden
DOI:10.1016/s0040-4039(98)01480-4
日期:1998.9
A tandem transannulation - cyclisationsequence from a cyclootenyl substituted α-ketenyl radical intermediate, viz1, is used as the basis of a new, formal, synthesis of the naturally occurring triquinane modhephene 2.
Tandem cyclisations involving α-ketenyl alkyl radicals. New syntheses of the natural triquinanes pentalenene and modhephene
作者:Benoît De Boeck、Nicole M. Harrington-Frost、Gerald Pattenden
DOI:10.1039/b413817c
日期:——
New synthetic approaches to the angular and propellane sesquiterpene triquinanes (+/-)-pentalenene 2 and (+/-)-modhephene 3, respectively, are described. The syntheses are based on tandemcyclisations involving alpha-ketene alkyl radical intermediates produced from alpha,beta-unsaturated acyl radical species, as highlighted in Schemes 2 and 4.
Synthesis of α-methylene propellanone via the strategic employment of metal-mediated cyclisation chemistry
作者:William J. Kerr、Angus J. Morrison、Laura C. Paterson
DOI:10.1016/j.tet.2015.06.003
日期:2015.8
Biologically active alpha-methylenene propellanone has been synthesised in 12 steps in an overall yield of 11%. The key step of the synthesis, an intramolecular Pauson-Khand reaction, proceeds in good yield under alkyl sulfide promotion conditions, to furnish the 5,5-fused moiety within the target Samarium diiodide-induced intramolecular conjugate addition onto the resulting cyclopentenone was used to complete the intriguing [3.3.3] propellanone skeleton. (C) 2015 Elsevier Ltd. All rights reserved.
Synthetic studies on arene-olefin cycloadditions. 4. Total synthesis of (.+-.)-modhephene
作者:Paul A. Wender、Geoffrey B. Dreyer
DOI:10.1021/ja00385a051
日期:1982.10
.alpha.-Lithio ketones. 1. Stereocontrolled synthesis of (.+-.)-modhephene via the Weiss reaction
作者:J. Wrobel、K. Takahashi、V. Honkan、G. Lannoye、J. M. Cook、Steven H. Bertz