Selective derivatisation of resorcarenes. Part 5. Acylation of tetrabenzoxazine derivatives†
Abstract
The reaction of the tetrabenzoxazines 2 with acetic anhydride under mild conditions leads selectively and exclusively to the tetraamides 3 in which the oxazine rings are opened; their structure was deduced from their 1H NMR spectra and confirmed for one example by an X-ray single crystal structure analysis; acylation of the hydroxy groups was not observed.