In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Synthesis of a dinuclear europium(III) complex through deprotonation and oxygen-atom transfer of trimethylamine N-oxide, published in 2019, which mentions a compound: 676-96-0, Name is Trimethylphosphineoxide, Molecular C3H9OP, Reference of Trimethylphosphineoxide.
A dinuclear Eu(III) complex Eu2(OCH2NMe2)2[N(SiMe3)2]4 (1) was synthesized via the reaction of Me3NO and Eu[N(SiMe3)2]3, during which the unprecedented C-H activation of Me3NO occurred along with oxygen-atom transfer. A simple Eu[N(SiMe3)2]3(OPMe3) adduct (2) was obtained when Me3PO was used, which should be due to the higher energy barrier and poorer product stability that prevent the formation of the phosphine substituted analog of 1.
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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem