Hayrapetyan, Davit published the artcileFacile Synthesis of Spirocyclic Lactams via [3+2] and [3+3] Aza-Annulation Reactions, COA of Formula: C6H8O3, the publication is European Journal of Organic Chemistry (2021), 2021(14), 2121-2125, database is CAplus.
Spirocyclic pyrrolidones and piperidones such as I and II were synthesized starting from readily available α-ketolactones and α-ketolactams employing [3+2]- and [3+3]-aza-annulation reactions. Tandem reactions of enamino lactams and lactones with maleic and itaconic anhydride yielded alkylidenespirolactams in good yields; further reduction of the exocyclic C=C double bond of the enamino moiety proceeded with excellent diastereoselectivity. Overall, one C-C and two C-N bonds, as well as three new stereocenters were created in a diastereoselective manner resulting in a fast upbuild of mol. complexity.
European Journal of Organic Chemistry published new progress about 517-23-7. 517-23-7 belongs to esters-buliding-blocks, auxiliary class Tetrahydrofuran,Ketone,Ester, name is 3-Acetyldihydrofuran-2(3H)-one, and the molecular formula is C6H8O3, COA of Formula: C6H8O3.
Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics