The crystal structure of the title compound, C11H18N5OP, is stabilized by an intermolecular N—H⋯N‐type hydrogen bond and another C—H⋯O interaction that is intramol­ecular. The N—H⋯N hydrogen bonding leads to inversion‐related dimers.

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The first 4-alkenylquinazolinone synthesis was described by Brack 17 as an acidic rearrangement reaction starting from quinoline-1-carboxamides. This procedure was applied by Zolotykh. 18 Similarly, Molina et al. 19 described the 4-methylene derivatives formation when refluxing 2-[(aminocarbonyl)

Regioselective sulfur–carbon bond formation from disubstituted thioureas and 1,2-dielectrophiles.