Photolactamization: A Novel Synthetic Entry into Large Ring-Sized Lactams
摘要:
Diene ketenes smoothly accessible by photochemical ring cleavage of omicron-quinol acetates, in the presence of primary or secondary amines afford the corresponding amides. In an intramolecular version of this reaction macrocyclic lactams of type A are produced, if aminoalkylated omicron-quinol acetates of type C are used as photo reactants. These photo reactants are available on acid mediated removal of the Boc-protecting group from Wessely acetoxylation products of type D, easily formed via compounds of type E from aminoalkylated phenols of type F.