NHC-catalyzed regiodivergent syntheses of difunctionalized 3-pyrazolidinones from α-bromoenal and monosubstituted hydrazine
作者:Chenxia Yu、Shide Shen、Ligen Jiang、Jing Li、Yumiao Lu、Tuanjie Li、Changsheng Yao
DOI:10.1039/c7ob02041d
日期:——
A formal [3 + 2] annulation of α-bromoenal with monosubstituted hydrazine could give 1,5 or 2,5-difunctionalized 3-pyrazolidinone regiodivergently by tuning the structure of the N-Heterocyclic Carbene (NHC) catalyst.
Synthesis, crystal structure, and fungicidal activity of novel 1,5-diaryl-1H-pyrazol-3-oxyacetate derivatives
作者:Yuanyuan Liu、Hong Shi、Yufeng Li、Hongjun Zhu
DOI:10.1002/jhet.424
日期:——
tate derivatives (5a–5i) have been efficiently synthesized by the reaction of 1,5-diaryl-1H-pyrazol-3-ols (4a–4i) with ethyl 2-bromoacetate. The structures of the newly synthesized compounds were characterized by 1H NMR spectra and elemental analysis, and the crystalstructure of the compound ethyl 2-(5-(4-chlorophenyl)-1-phenyl-1H-pyrazol-3-yloxy)acetate (5c) was determined by single crystal X-ray
通过1,5-二芳基-1 H-吡唑-3-的反应已有效地合成了一系列2-(1,5-二芳基-1 H-吡唑-3-基氧基)乙酸乙酯(5a-5i)。含2-溴乙酸乙酯的醇(4a–4i)。通过1 H NMR光谱和元素分析表征了新合成的化合物的结构,以及该化合物的乙基2-(5-(4-氯苯基)-1-苯基-1 H-吡唑-3-基氧基)的晶体结构。通过单晶X射线衍射分析确定乙酸盐(5c)。化合物5c属于三斜晶系,空间群为P(-1),a = 5.8170(12)Å,b = 11.804(2)Å,Ç = 12.783(2)埃,α= 83.89(2)°,β= 89.24(3)°,γ= 89.73(3)°,式重量:356.80,三斜晶系V = 872.7(3)3,d c ^ = 1.358 mg / m 3,Z = 2,F(000)=372。生物测定结果表明,化合物2-(5-(4-氟苯基)-1-苯基-1 H-吡唑-3-酰氧基)乙酸乙酯(5d)在10μg/
Synthesis, Crystal Structure, and Fungicidal Activity of Novel 1,5-Diaryl-1<i>H</i>-Pyrazol-3-Oxy Derivatives Containing Oxyacetic Acid or Oxy(2-thioxothiazolidin-3-yl)ethanone Moieties
5‐diaryl‐1H‐pyrazol‐3‐oxy derivatives containing oxyacetic acid or oxy(2‐thioxothiazolidin‐3‐yl)ethanone moieties were prepared from methyl 3‐arylacrylates via a serial of reactions included addition‐cyclization, oxidation, substitution, hydrolysis, and condensation. Their structures were confirmed by 1H‐NMR, 13C‐NMR, IR, and elemental analysis. In addition, the crystal structure of the compound 2‐(1,5‐dipheny