Internal Nucleophilic Catalyst Mediated Cyclisation/Ring Expansion Cascades for the Synthesis of Medium‐Sized Lactones and Lactams
作者:Aggie Lawer、James A. Rossi‐Ashton、Thomas C. Stephens、Bradley J. Challis、Ryan G. Epton、Jason M. Lynam、William P. Unsworth
DOI:10.1002/anie.201907206
日期:2019.9.23
for the synthesis of medium-sized lactones and lactams from linear precursors is described in which an amine acts as an internal nucleophilic catalyst to facilitate a novel cyclisation/ring expansion cascade sequence. This method obviates the need for the high-dilution conditions usually associated with medium-ring cyclisation protocols, as the reactions operate exclusively via kinetically favourable