Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Azepin-4-ones ( ) and ( ) are synthesized by Flash Vacuum Thermolysis of the isoxazolines ( ) and of the isoxazolidine ( ) obtained by 1,3-dipolar cycloadditions to methylenecyclobutane. ... Azepin-4-ones are synthesized by FVT of the isoxazolines (3) ...