Diastereoselective formation of cyclic carbonates by cyclization of alkenyloxycarbonyloxy radicals
作者:Athelstan L.J Beckwith、Ian G.E Davison
DOI:10.1016/s0040-4039(00)71215-9
日期:1991.1
The alkenyloxycarbonyloxy radical (8) derived from trans-hex-2-en-l-ol via the N-hydroxypyridine-2-thione carbonate (4) undergoes fast (k(c) > 4.0 x 10(8) s-1 at 80-degrees-C) cyclization exclusively in the exo mode to give a cyclic radical (9) which is converted into products (6,7) by diastereoselective S(H)2 reactions; radicals derived from homoallylic alcohols behave similarly.