Radical-induced epoxide fragmentation chemistry. n-Bu3Sn· radical catalyzed isomerization of epoxyketones to carbocycles
摘要:
Cyclic alpha,beta-epoxyketones are converted to bi- or tricyclic beta-hydroxyketones in the presence of n-Bu3Sn. radical. Addition of n-Bu3Sn. to the carbonyl group gives a ketyl radical that triggers the epoxide fragmentation which is then followed by a 1,5-hydrogen abstraction and cyclization. Reversibility in the last two steps of the sequence is demonstrated.
Radical cyclization of epoxyketones via a 1,5-Bun 3Sn group or a 1,5-H atom transfer
作者:Sunggak Kim、Jae Suk Koh
DOI:10.1039/c39920001377
日期:——
Radical cyclization of epoxyketones is initiated by Bun3Sn radical addition to epoxyketones, followed by epoxide fragmentation, 1,5-H- or 1,5-Bun3Sn transfer, and cyclization.