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 Photochemical reactions of N-2,3-dihydrobenzoxazol-2-ones, published in 1979-04-30, which mentions a compound: 54903-09-2, Name is 6-Acetylbenzo[d]oxazol-2(3H)-one, Molecular C9H7NO3, Recommanded Product: 6-Acetylbenzo[d]oxazol-2(3H)-one.
Photo-Fries rearrangements of N-acyl-2,3-dihydrobenzoxazol-2-ones (I; R = Ac, COEt, COPr, COCHMe2, Bz, COC6H4Me-p) are described. Irradiation of I in MeCN afforded a mixture of 2-acyl-2,3-dihydrobenzoxazol-2-one and 6-acyl-2,3-dihydrobenzoxazol-2-one together with other minor products. However, I (R = H, Me) were very photostable. The reaction scheme involving Norrish type I dissociation is discussed.
The article 《Photochemical reactions of N-2,3-dihydrobenzoxazol-2-ones》 also mentions many details about this compound(54903-09-2)Recommanded Product: 6-Acetylbenzo[d]oxazol-2(3H)-one, you can pay attention to it, because details determine success or failure
Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics