A selenurane derivative promotes β-fragmentation of carbinolamides leading to cyclic imides
摘要:
The alkoxy radical intermediates generated by reaction of carbinolamides with diphenylselenium hydroxyacetate (1) in the presence of iodine and under irradiation with visible light undergo beta-fragmentation to afford 3,4-substituted cyclic imides in good yields.
作者:Rosendo Hernandez、Silvia M. Velazquez、Ernesto Suarez、Maria S. Rodriguez
DOI:10.1021/jo00100a049
日期:1994.10
A short and efficient synthesis of (+)-8-deoxyvernolepin (2) from (-)-alpha-santonin (8), by functionalization of the angular methyl from a 2 beta- or 6 beta-alkoxy radical generated by reaction of the alcohol 6 or 7 with diphenylhydroxyselenium acetate and iodine and l,4-fragmentation of the gamma-hydroxystannane 35 using hypervalent organoiodine reagents as the key steps, is described. The most important structural features of this compound and other vernolepin congeners, the delta 8-valerolactone cis-fused to ring B moiety and the angular vinyl group, are introduced in the same step.