Unusual tandem sequence of oxa Diels–Alder reaction, retro Diels–Alder reaction, and oxa 6π-electrocyclic ring opening in the reaction of 6-amino-4-(4-methoxyphenyl)-2H-pyran-2-ones with benzaldehydes
作者:Adil I. Khatri、Shriniwas D. Samant
DOI:10.1039/c4ra13374a
日期:——
The oxaDiels–Alder reaction of 6-amino-4-(4-methoxyphenyl)-2H-pyran-2-ones with benzaldehydes took an unusual path whereby a tandem sequence of the oxaDiels–Alder reaction, retro Diels–Alder reaction, and 6π-electrocyclic ring opening of the pyran yielded 3-(4-methoxyphenyl)-5-phenyl-1-(piperidin-1-yl/pyrrolidin-1-yl)penta-2,4-dien-1-ones. The reaction took place in boiling toluene with a series
Three‐Component Castagnoli‐Cushman Reaction of 3‐Arylglutaconic Acid Anhydrides, Carbonyl Compounds, and Ammonium Acetate: a Quick and Flexible Way to Assemble Polysubstituted
<i>NH</i>
‐δ‐lactams
作者:Anatoly A. Peshkov、Olga Bakulina、Dmitry Dar'in、Grigory Kantin、Anton Bannykh、Vsevolod A. Peshkov、Mikhail Krasavin
DOI:10.1002/ejoc.202001617
日期:2021.3.19
Three‐component Castagnoli‐Cushman reaction of 3‐arylglutaconic anhydrides with carbonylcompound and ammonium acetate delivers medicinally important NH‐δ‐lactams. The scope of the protocol has been thoroughly explored paying particular attention to the carbonyl component using wide array of aliphatic and aromatic aldehydes as well as rarely involved cyclic and acyclic ketones.
Three-Component Castagnoli–Cushman Reaction of 3-Arylglutaconic Acids with Aromatic Aldehydes and Amines Delivers Rare 4,6-Diaryl-1,6-dihydropyridin-2(3<i>H</i>)-ones
Attempted use of 3-arylglutaconic acids in the three-component version of the Castagnoli–Cushman reaction with amines and aromatic aldehydes resulted in an unexpected formation of 4,6-diaryl 1,6-dihydropyridine-2(3H)-ones. These are of interest as representatives of a rare heterocyclic chemotype for de novo biological investigation. Alternatively, these compounds can be oxidized into their 2-pyridone
New Synthetic Approaches to Substituted Pyridine-2-(1<i>H</i>)-ones Clubbed with Substituted Aryl Diazo Substituents
作者:Navin B. Patel、Rakesh D. Sharma
DOI:10.1080/00397911.2011.630771
日期:2013.5.3
synthesized by coupling 4-(4-methoxyphenyl)-6-(1H-1,2,4-triazol-1-yl)-1-(3-chlorophenyl)pyridin-2(1H)-one with substituted benzenediazonium chlorides in the form of two isomers, which were separated by column chromatography and characterized by 1H and 13C NMR. Following the green approach, solvents were avoided as much as possible. The reaction monitoring was carried out by gas chromatography as well
one-pot Staudinger/aza-Wittig/Castagnoli-Cushman reaction sequence for a series of azido aldehydes and homophthalic anhydrides is described. The reaction proceeded at room temperature and delivered novel polyheterocycles related to the natural product realm in high yields and high diastereoselectivity. The methodology has been extended to three other cyclic anhydrides. These further unravel the potential