Unexpected C–C Bond Cleavage: A Route to 3,6-Diarylpyridazines and 6-Arylpyridazin-3-ones from 1,3-Dicarbonyl Compounds and Methyl Ketones
摘要:
An unexpected C-C bond cleavage has been revealed in the absence of metal. This observation has been exploited to develop an efficient approach toward 3,6-iarylpyridazines and 6-arylpyridazin-3-ones from simple and commercially available 1,3-dicarbonyl compounds and methyl ketones.
A copper-catalyzed domino synthesis of 4H-pyrido[1,2-a]pyrimidin-4-ones has been developed from 1,4-enediones and 2-aminoheterocycles with air as the oxidant.
Transition-metal-free synthesis of chalcogenated furans through the sequential thiol-Michael/Paal–Knorr reaction of 1,4-enediones in the presence of a catalytic amount of p-toluenesulfonic acid has been developed. The present one-pot strategy involves the thiol Michael addition to 1,4-enediones in an anti-Markovnikov fashion with the formation of a new C–S bond, followed by intramolecular dehydrative
DABCO‐Promoted Bicyclization/Rearrangement Reaction Synthesis of Tetrasubstituted Furans and Furo[3,4‐<i>d</i>]pyrimidine‐2,4‐diones from 1,4‐Enediones
A DABCO-promoted bicyclization/rearrangementreaction has been developed for the synthesis of polysubstituted furans, which produced to furo[3,4-d]pyrimidine-2,4-diones under heating conditions.
DABCO 促进的双环化/重排反应已被开发用于合成多取代呋喃,该反应在加热条件下生成呋喃[3,4- d ]嘧啶-2,4-二酮。
Synthesis of Tetrasubstituted Unsymmetrical 1,4-Enediones via Copper-Promoted Autotandem Catalysis and Air As the Oxidant
An efficient procedure has been developed for the preparation of tetrasubstituted unsymmetrical 1,4-enediones via copper-promoted autotandem catalysis and air as the oxidant. Various N-nucleophiles are compatible with this reaction, such as morpholine, piperidine, pyrrolidine, arylamines, pyrazole, imidazole, benzimidazole, and benzotriazole. This reaction also has significant advantages in easily available substrates, atom economy, bond-forming efficiency, and environmental benignity.