Transfer Hydrogenation in Water: Enantioselective, Catalytic Reduction of α-Cyano and α-Nitro Substituted Acetophenones
作者:Omid Soltani、Martin A. Ariger、Henar Vázquez-Villa、Erick M. Carreira
DOI:10.1021/ol1008894
日期:2010.7.2
Catalytic reduction of α-substituted acetophenones under conditions involving asymmetric transfer hydrogenation in water is described. The reaction is conducted in water and open to air, and formic acid is used as reductant.
Silver and Palladium Cocatalyzed Carbonylative Activation of Benzotriazoles to Benzoxazinones under Neutral Conditions
作者:Zhiping Yin、Zechao Wang、Xiao-Feng Wu
DOI:10.1021/acs.orglett.7b03184
日期:2017.11.17
A novel and efficient method for the carbonylative activation of benzotriazoles to benzoxazinones has been developed. By using a silver and palladium bimetallic catalyst system, a broad range of benzotriazoles were transformed into the corresponding benzoxazinones in moderate to good yields with excellent functional group tolerance. Notably, this procedure proceeds under neutral conditions.
Mechanochemical synthesis of 2,5-disubstituted1,3,4-oxadiazoles was developed as an environmentally benign alternative to conventional solvent-based methods. In the presence of triphenylphosphine and trichloroisocyanuric acid, N-acylbenzotriazoles condense with acylhydrazides leading to oxadiazoles derivatives in good to excellent yields within minutes. The approach circumvents the need for strictly
B<sub>2</sub>(OH)<sub>4</sub>-Mediated Reductive Transamidation of <i>N</i>-Acyl Benzotriazoles with Nitro Compounds En Route to Aqueous Amide Synthesis
作者:Jin Bai、Shangzhang Li、Riqian Zhu、Yang Li、Wanfang Li
DOI:10.1021/acs.joc.2c02995
日期:2023.3.17
We herein developed a reductive transamidation reaction between N-acyl benzotriazoles (AcBt) and organic nitro compounds or NaNO2 under mild conditions. This protocol employed the stable and readily available B2(OH)4 as the reducing agent and H2O as the ideal solvent. N-Deuterated amides can be synthesized when conducting the reaction in D2O. A reasonable reactionmechanism involving bond metathesis
我们在此开发了N -酰基苯并三唑 (AcBt) 与有机硝基化合物或 NaNO 2在温和条件下的还原转酰胺基反应。该方案使用稳定且易于获得的 B 2 (OH) 4作为还原剂,使用 H 2 O 作为理想溶剂。当在 D 2 O中进行反应时,可以合成N-氘代酰胺。提出了一个合理的反应机制,包括 AcBt 酰胺和氨基硼酸中间体之间的键复分解,以解释 AcBt 的独特性质。
Base-Promoted Reaction between N-Acyl Benzotriazoles and p-Toluenesulfonylmethyl Isocyanide (TosMIC): A Facile Synthesis of 4,5-Disubstituted Oxazoles
作者:Wanfang Li、Hui You、Daming Liu、Mengni Pan、Yue Shen、Yang Li
DOI:10.1055/a-2352-4950
日期:2025.3
We herein developed a base-promoted cyclization reaction between N-acyl benzotriazoles and p-toluenesulfonylmethyl isocyanide (TosMIC) to afford 4,5-disubstituted oxazoles. In the presence of 3 equiv of K3PO4, the two readily available starting materials reacted in N,N-dimethylformamide at 80 °C to give 28 examples of 4-tosyl-5-aryl, -alkyl, or -alkenyl-substituted oxazoles in moderate to high yields
我们在此开发了 N-酰基苯并三唑和对甲苯磺酰甲基异氰化物 (TosMIC) 之间的碱促进环化反应,得到 4,5-二取代恶唑。在 3 当量的 K 3 PO 4 存在下,两种容易获得的起始原料在 N,N-二甲基甲酰胺中于 80 °C 反应,得到 28 个 4-甲苯磺酰基- 5-芳基、-烷基或-烯基取代的恶唑,产率中等至高。