A Silver‐Catalyzed Modular Intermolecular Access to 6,6‐Spiroketals
作者:Alexander Ahrens、Niklas F. Heinrich、Simon R. Kohl、Martha Hokamp、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/adsc.201900988
日期:2019.12.17
A modular synthesis of 6,6‐spiroketals via silver catalysis is reported. By combining an intermolecular Michael addition and a 6‐endo‐dig cyclization, this cascade reaction allows the modular preparation of highly substituted 6,6‐spiroketals by combining two substrate molecules. Established methods accessing this interesting substructure are complemented by this new transformation. The protocol tolerates