Prostaglandin endoperoxide model compounds. Part 2. Stereospecific synthesis of isomeric 5-bromo-2,3-dioxabicyclo[2.2.1]heptanes and 2-bromo-6,7-dioxabicyclo[3.2.1]octanes
作者:A. J. Bloodworth、Henny J. Eggelte
DOI:10.1039/p19810003272
日期:——
via hydroboration and autoxidation, and converted by bromination into trans-3,cis-4-dibromocyclopentyl hydroperoxide (10). Reaction of compound (10) with silver oxide has afforded endo-5-bromo-2,3-dioxabicyclo[2.2.1]heptane (11)(42%), whereas treatment of compound (10) with silver trifluoroacetate has provided exo-5-bromo-2,3-dioxabicyclo[2.2.1]heptane (15)(6%) and exo-5-trifluoroacetoxy-2,3-dioxabiclo[2
Reassignment of configurations for 5-bromo-2,3-dioxabicyclo[2.2.1]heptanes and its mechanistic implications
作者:A.J. Bloodworth、H.J. Eggelte
DOI:10.1016/0040-4039(81)80179-7
日期:1981.1
The configuration of the 5-bromo-2,3-dioxabicyclo[2.2.1]heptane obtained by treating 3,4-dibromocyclopentyl hydroperoxide with AgO2CCF3 and that of the isomer obtained using Ag2O have been reassigned after identifying which 4-bromocyclopentane-1,3-diol is obtained from each upon catalytic hydrogenation. This implies a bromonium ion mechanism for the AgO2CCF3-induced dioxabicyclization in contrast to