In sharp contrast with the standard [2 + 2 + 2] cycloadditionreaction of diyne/ene, cobalt-mediated cycloadditions with γ-alkylidenebutenolide led to unprecedented cobalt(III) polycyclic complexes. A plausible mechanism supported by a computational study based on an unusual fragmentation of the butenolide moiety was postulated to account for this original reaction.
A tunable copper-catalyzed multicomponent reaction towards alkaloid-inspired indole/lactam polycycles
作者:M. I. D. Mardjan、S. Perie、J.-L. Parrain、L. Commeiras
DOI:10.1039/c7ob00532f
日期:——
A versatile copper(I)-catalyzed cascade multicomponent reaction strategy between readily available (Z)-3-iodoacrylic acids, terminal alkynes, and primary amines is reported, leading to a great diversity of complex heterocyclic backbones based on biorelevant indole/lactam scaffolds.
multicomponent coupling reaction between readily available (Z)‐3‐iodoacrylic acids, terminal alkynes, and primary amines was developed to smoothly access a small library of 5‐hydroxy‐1H‐pyrrol‐2(5H)‐ones in good yields. This practical and general process was applied to a short‐steps synthesis of the natural product pulchellalactam.
This reviews surveys the preparation of a great diversity of complex biorelevant gamma-lactam backbones thanks to scalable copper(I)-catalyzed cascade multicomponent processes.