合成了一系列 1,2,3-三唑结合的阳离子 Au(I) 催化剂,并通过 X 射线晶体学表征了它们的结构。变温核磁共振研究揭示了溶液中的动态三唑-金阳离子配位。反应曲线清楚地表明,这些新催化剂比文献报道的 Au 催化剂具有更好的热稳定性,包括 IPrAu x NTf(2)。通过应用这些催化剂,用反应性较低的内炔和未保护的脂肪胺实现了具有挑战性的分子间加氢胺化反应,在低催化剂负载的情况下获得了优异的产率。
Reductive Alkylation of Hydrazine Derivatives with α-Picoline-Borane and Its Applications to the Syntheses of Useful Compounds Related to Active Pharmaceutical Ingredients
ingredients of therapeutic drugs such as isocarboxazid. An efficient method for the direct reductive alkylation of hydrazine derivatives with α-picoline-borane has been developed to synthesize a variety of N-alkylhydrazine derivatives. This method provided N,N-dialkylhydrazine derivatives and N-monoalkylhydrazine derivatives upon fine-tuning of the substrates and the reagent equivalency in a one-pot manner
Oxidative Sulfonylation of Hydrazones Enabled by Synergistic Copper/Silver Catalysis
作者:Jun Xu、Chao Shen、Xian Qin、Jie Wu、Pengfei Zhang、Xiaogang Liu
DOI:10.1021/acs.joc.0c02249
日期:2021.3.5
A copper/silver-cocatalyzed protocol for oxidative sulfonylation of hydrazones is demonstrated. A wide range of β-ketosulfones and N-acylsulfonamides are directly synthesized in moderate to good yields. Our work provides a viable method for scalable preparation of β-ketosulfone derivatives that have found wide applications in the pharmaceutical industry.
Visible Light‐Induced [3+2] Cyclization Reactions of Hydrazones with Hypervalent Iodine Diazo Reagents for the Synthesis of 1‐Amino‐1,2,3‐Triazoles
作者:Jun‐Ying Dong、He Wang、Shukuan Mao、Xin Wang、Ming‐Dong Zhou、Lei Li
DOI:10.1002/adsc.202001436
日期:2021.4.13
In this study, visible‐light‐induced [3+2] cyclization reactions of hydrazones with hypervalent iodine diazo reagents as diazomethyl radical precursors are reported. Mild reaction conditions, a broad substrate scope, and excellent functional group compatibility were observed. Furthermore, the synthetic utility was demonstrated by gram‐scale synthesis and elaboration to several value‐added products
the chemoselective mono- and diamination of ketoneusing pyrazole as the amine source in a combined copper–organocatalyst system. Various substrates are compatible, providing the corresponding products in moderate to good yields. This strategy gives an efficient and convenient solution for the synthesis of α-pyrazole and α,α-dipyrazole ketonederivatives. The control experiment demonstrates that in