Asymmetric synthesis of 1H-pyrrol-3(2H)-ones from 2,3-diketoesters by combination of aldol condensation with benzilic acid rearrangement was written by Sha, Qiang;Arman, Hadi;Doyle, Michael P.. And the article was included in Chemical Communications (Cambridge, United Kingdom) in 2016.Recommanded Product: 13669-10-8 This article mentions the following:
An efficient two-step protocol for the asym. synthesis of 1H-pyrrol-3(2H)-one derivatives in 99% ee from conveniently accessed 2,3-diketoesters was developed. E.g., aldol reaction of benzyl2,2-dihydroxy-3-oxobutanoate hydrate 1a and cyclohexanone 2a in the presence of L-proline as organocatalyst in DCM gave a 68% yield of (R)-benzyl 2-hydroxy-3-oxo-2-[(S)-2-oxocyclohexyl]butanoate (3a) and a 24% yield of (S)-benzyl 2-hydroxy-3-oxo-2-[(S)-2-oxocyclohexyl]butanoate (4a). Subsequent benzilic acid rearrangement reaction of 3a in the presence of aniline and 20 mol% CF3CO2H/DCM at 65° gave (R)-benzyl 2-methyl-3-oxo-1-phenyl-2,3,4,5,6,7-hexahydro-1H-indole-2-carboxylate in 87% yield. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8Recommanded Product: 13669-10-8).
Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Recommanded Product: 13669-10-8
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics