Synthesis of fused bicyclic rings by tandem radical ring expansion/cyclization: Evaluating competing intramolecular reactions
作者:Cunxiao Wang、Xin Gu、Marvin S. Yu、Dennis P. Curran
DOI:10.1016/s0040-4020(98)00467-0
日期:1998.7
and three-carbon “Dowd-Beckwith” ringexpansions of cyclopentanones and cyclohexanones are generally successful, but tandem expansion/cyclization reactions can be compromised by competing processes. An evaluation of the competition between ringexpansion, 1,5-hydrogen transfer, and 6-exo cyclization provides information on how to design successful tandem expansion cyclization sequences.