3-Butenoic acid (Vinylacetic acid) can be used to synthesize bicyclic 3,6-dihydro-1,2-oxazine. Strained bicyclic 3,6-dihydro-1,2-oxazine is a reactive substrate in domino metathesis with an external alkene[1][2].
[1]. GÉraldine Calvet, et al. Domino metathesis of 3,6-dihydro-1,2-oxazine: access to isoxazolo[2,3-a]pyridin-7-ones. Org Lett. 2007 Apr 12;9(8):1485-8. [2]. M A Casado-Rodriguez, et al. Synthesis of vinyl-terminated Au nanoprisms and nanooctahedra mediated by 3-butenoic acid: direct Au@pNIPAM fabrication with improved SERS capabilities. Nanoscale. 2016 Feb 28;8(8):4557-64.