In memoriam Albert van Leusen
Abstract
A series of tetrazole-linked dibenzo[b,f][1,4]oxazepines is synthesized through a short sequence involving an Ugi tetrazole
reaction. The intermediate tetrazole undergoes a potassium carbonate mediated SNAr cyclization, followed by oxidation to afford the target tricyclic heterocyclic
scaffold. The optimization, scope and limitations of this two-step and efficient methodology
are investigated. A 1000-member library of tetrazole-linked dibenzo[b,f][1,4]oxazepines is generated and the physicochemical properties are analyzed. great
Key words
dibenzo[
b,
f][1,4]oxazepines - Ugi tetrazole - cyclization - library - drug-like properties