Antiproliferating polyquinanes. V Di- and triquinanes involving .ALPHA.-methylene or .ALPHA.-alkylidene cyclopentanone, cyclopentanone, and .GAMMA.-lactone systems.
Synthesis and rearrangement of functionalized dispiro[2.1.3.3]Undecanes - preferred C4C5 over C3C4 ring enlargements
作者:Lutz Fitjer、Marita Majewski、Andreas Kanschik、Ernst Egert、George M Sheldrick
DOI:10.1016/s0040-4039(00)84860-1
日期:1986.1
The functionalized dispiro[2.1.3.3]undecanes and undergo cascade rearrangements to yield the bi- and tricyclic systems , , and , respectively. The rearrangements proceed via an initial enlargement of the four-membered ring.
Synthesis of propellanes by “exocyclic” transannular cycloaddition of olefinic methylenecyclopropanes
作者:Shigeru Yamago、Eiichi Nakamura
DOI:10.1016/s0040-4020(01)80134-4
日期:——
Olefinicmethylenecyclopropanes undergo quantitative transannular ring closure under Group 10 metal catalysis to give [3.3.3]propellanes through cycloaddition of trimethylenemethane-like intermediate.
Towards a synthesis of (±)modhephene via cascade rearrangement: Synthesis and rearrangement of dispiro[3.0.4.2]undecanes to [3.3.3]propellanes
作者:Lutz Fitjer、Marita Majewski、Andreas Kanschik
DOI:10.1016/s0040-4039(00)80271-3
日期:1988.1
The dispiro [3.0.4.2] undecanes 2 and 6 undergo cascade rearrangements yielding the [3.3.3]propellanes 3 and 7, respectively. The rearrangement of 6 proceeds regiospecifically and renders 9 a promising candidate for a direct conversion to (±)modhephene 10.
Synthesis of [3.3.3]propellanes by ‘exocyclic’ transannular cycloaddition of olefinic methylenecyclopropanes
作者:Shigeru Yamago、Eiichi Nakamura
DOI:10.1039/c39880001112
日期:——
Olefinicmethylenecyclopropanes undergo quantitative transannular ring closure under catalysis by Group 10 metals to give [3.3.3]propellanes, through cycloaddition of a trimethylenemethane-like intermediate.