Palladium-catalyzed ring expansion of vinyl, oxaspirohexanes
摘要:
Pd(0)-catalyzed ring expansion of vinyl oxaspirohexanes occurred smoothly in the presence of 1 equiv of p-nitrophenol in tetrahydrofuran, yielding initially 2-vinylcyclopentanones in high yields. However, vinyl oxaspiroheptanes failed to undergo ring expansion under the present conditions.
Free radical mediated ring expansion of vinyl epoxides
作者:Sunggak Kim、Sangphil Lee
DOI:10.1016/0040-4039(91)80225-u
日期:1991.11
Freeradical mediated ring expansion of vinyl epoxides occurred smoothly via n-Bu3Sn or PhS radical addition to vinyl epoxides, epoxide fragmentation, β-cleavage of alkoxy radicals, cyclization, and elimination.