AbstractA tunable aromatic CH insertion and a Wolff rearrangement of α‐diazo β‐keto esters precursor were developed. Different directing groups on nitrogen led with high selectivity to either dihydroquinoline or 2‐carbamoylacrylate motifs, which can be transformed to multiple heterocyclic scaffolds.magnified image
Direct Amination of γ-Halo-β-ketoesters with Anilines
摘要:
The direct amination of alpha-haloacetoacetates with anilines is described. Compared to existing methods, this simple protocol provides an attractive strategy to prepare diverse gamma-anilino-beta-ketoesters in one step. Good to excellent yields of the amination products were obtained under robust conditions, providing versatile and useful scaffolds.
Direct Amination of γ-Halo-β-ketoesters with Anilines
作者:Yinan Zhang、Richard B. Silverman
DOI:10.1021/jo300239e
日期:2012.4.6
The direct amination of alpha-haloacetoacetates with anilines is described. Compared to existing methods, this simple protocol provides an attractive strategy to prepare diverse gamma-anilino-beta-ketoesters in one step. Good to excellent yields of the amination products were obtained under robust conditions, providing versatile and useful scaffolds.
Arylazanylpyrazolone Derivatives as Inhibitors of Mutant Superoxide Dismutase 1 Dependent Protein Aggregation for the Treatment of Amyotrophic Lateral Sclerosis
作者:Yinan Zhang、Radhia Benmohamed、He Huang、Tian Chen、Cindy Voisine、Richard I. Morimoto、Donald R. Kirsch、Richard B. Silverman
DOI:10.1021/jm400079a
日期:2013.3.28
The arylsulfanylpyrazolone and aryloxanylpyrazolone scaffolds previously were reported to inhibit Cu/Zn superoxide dismutase 1 dependent protein aggregation and to extend survival in the ALS mouse model. However, further evaluation of these compounds indicated weak pharmacokinetic properties and a relatively low maximum tolerated dose. On the basis of an ADME analysis, a new series of compounds, the arylazanylpyrazolones, has been synthesized, and structure-activity relationships were determined. The SAR results showed that the pyrazolone ring is critical to cellular protection. The NMR, IR, and computational analyses suggest that phenol-type tautomers of the pyrazolone ring are the active pharmacophore with the arylazanylpyrazolone analogues. A comparison of experimental and calculated IR spectra is shown to be a valuable method to identify the predominant tautomer.
α-Diazo β-Keto Ester as Precursor to Aromatic CH Insertion and Wolff Rearrangement with Different Directing Groups
作者:Biao Ma、Fang-Lei Chen、Xing-Yu Xu、Yi-Nan Zhang、Li-Hong Hu
DOI:10.1002/adsc.201300763
日期:2014.2.10
AbstractA tunable aromatic CH insertion and a Wolff rearrangement of α‐diazo β‐keto esters precursor were developed. Different directing groups on nitrogen led with high selectivity to either dihydroquinoline or 2‐carbamoylacrylate motifs, which can be transformed to multiple heterocyclic scaffolds.magnified image