Zwitterion-Catalyzed Deacylative Dihalogenation of β-Oxo Amides
摘要:
alpha,alpha-Dihalo-N-arylacetamides are commonly used as intermediates in various organic reactions. In the study described here, a catalytic synthesis of alpha,alpha-dihalo-N-arylacetamides from beta-oxo amides was developed using zwitterionic catalysts and N-halosuccinimides as the halogen sources. The corresponding alpha,alpha-dihalo-N-arylacetamides were obtained in good to excellent yields, and no aromatic halogenated side products were detected. The reaction conditions were mild, and no strong base or acid was required.
Copper-Catalysed (Diacetoxyiodo)benzene-Promoted Aerobic Esterification Reaction: Synthesis of Oxamates from Acetoacetamides
作者:Zhiguo Zhang、Xiaolong Gao、Haifeng Yu、Guisheng Zhang、Jianming Liu
DOI:10.1002/adsc.201800616
日期:2018.9.3
A copper‐catalysed (diacetoxyiodo)benzene‐promoted aerobic esterification reaction of acetoacetamides was developed for the synthesis of oxamates, which are useful precursors in synthetic organic chemistry. This practical and mild synthetic approach proceeded at 25 °C under open‐air conditions and afforded methyl 2‐oxo‐2‐(phenylamino)acetates in good to excellent yields combined with C−C σ‐bond cleavage
Preparation and antiinflammatory activity of 2- and 4-pyridones
作者:James Benjamin Pierce、Zaven S. Ariyan、Gaye Stuart Ovenden
DOI:10.1021/jm00344a008
日期:1982.2
been self-condensed to form pyridones. N-Alkylacetoacetamides give 2-pyridones, while N-arylacetoacetamides give 4-pyridones. In an attempt to develop nonacidic, nonsteroidal antiinflammatory agents, the pyridones were tested in a carrageenan-induced pedal edema assay in rats. While the 2-pyridones were not active, 9 of 17 4-pyridones tested were active, and one compound (4g) had antiinflammatory efficacy
evaluation of a series of Cisd2 activators, all thiophene analogs, based on a hit obtained using two-stage screening and prepared via either the Gewald reaction or by intramolecular aldol-type condensation of an N,S-acetal. Metabolic stability studies of the resulting potent Cisd2 activators suggest that thiophenes 4q and 6 are suitable for in vivo studies. The results from studies on 4q-treated and
Cycloheptenones are widespread in natural products and bioactive molecules. An efficient and convenient NaH-mediated CopeRearrangement of doubly activated vinylcyclopropanes is reported for the synthesis of cyclohepten-4-ones. These flexible intramolecular reactions were applicable to a wide range of substrates and could be performed on gram scale. The derivatization of the product leads to short
环庚烯酮广泛存在于天然产物和生物活性分子中。据报道,一种高效且方便的 NaH 介导的双活化乙烯基环丙烷 Cope 重排用于环庚烯-4-酮的合成。这些灵活的分子内反应适用于多种底物,并且可以在克规模上进行。产品的衍生化可以快速高效地合成一些有用的功能分子。
PIERCE, J. B.;ARIYAN, Z. S.;OVENDEN, G. S., J. MED. CHEM., 1982, 25, N 2, 131-136