Cyclopropanation in vinyl radical cyclizations: The importance of structural constraints.
摘要:
Cyclopropanation has been observed as sole reaction path in the vinyl radical cyclization of bicyclic olefins 1a and 1b. Additional models have been prepared to study the influence of structural parameters on the origin of this unusual reactivity. Structural constraints in the intermediate homoallyl radical formed stand out as the dominating factor in this case.