Transition metal catalyzed radical cyclization: new preparative route to .gamma.-lactams from allylic alcohols via the [3.3]-sigmatropic rearrangement of allylic trichloroacetimidates and the subsequent ruthenium-catalyzed cyclization of N-allyltrichloroacetamides
摘要:
A sequence of reactions including [3.3]-sigmatropic rearrangement of allyl trichloroacetimidates (Overman rearrangement) followed by ruthenium-catalyzed cyclization of N-allyltrichloroacetamides provided a novel method for preparing trichlorinated gamma-lactams from allylic alcohols. No delta-lactam was formed as a byproduct. The cyclization of secondary N-allyltrichloroacetamides proceeded with good diastereoselectivity. Two types of tandem cyclizations to form bicyclic lactams took place in the cyclization of N-allyltrichloroacetamides from geraniol and linalool.
A novel preparative method for γ-butyrolactams via carbon–carbon bond formation: copper or ruthenium-catalysed cyclization of N-allyl trichloroacetamides
作者:Hideo Nagashima、Hidetoshi Wakamatsu、Kenji Itoh
DOI:10.1039/c39840000652
日期:——
Trichlorinated γ-butyrolactams are formed by copper or ruthenium-catalysedcyclization of Nallyl tichloroacetamides.