Novel carbocyclization of a D-glucose-derived alkene
作者:Derek Horton、James P. Roski
DOI:10.1039/c39920000759
日期:——
Cyclopentadiene reacts with a D-glucose-derived hex-3-enose derivative to give norbornene derivatives attached at the 2,3-position of a 1,6-anhydrohexose skeleton; although the bicyclic enone isolevoglucosenone is a plausible intermediate in this reaction, the products actually appear to arise through initial cycloaddition to a rearranged acyclic sugar derivative with subsequent generation of the anhydro ring.
Cycloaddition of Cyclopentadiene to 3-Deoxy-1,2:5,6-di-<i>O</i>-isopropylidene-α-<scp>d</scp>-<i>erythro</i>-hex-3-enofuranose. Synthesis and Representative Chemistry of 1,6-Anhydro-2,3-dideoxy-β-<scp>d</scp>-<i>glycero</i>-hex-2-enopyran-4-ulose (“Isolevoglucosenone”)
作者:Derek Horton、James P. Roski、Peter Norris
DOI:10.1021/jo960032y
日期:1996.1.1
with cyclopentadiene in the presence of a Lewis acid results in the formation of cycloadditionproducts 8-11. Evidence is presented to show that these 1,6-anhydro sugar-cyclopentadiene adducts do not arise from rearrangement of 4 to isolevoglucosenone (5) followed by cycloaddition but are the result of Lewis acid-catalyzed rearrangement of alkene 4 to acyclic dienophile 12 followed by addition of cyclopentadiene