Triflic Anhydride Mediated Synthesis of Imidazo[1,5-<i>a</i>]azines
作者:Guillaume Pelletier、André B. Charette
DOI:10.1021/ol400870b
日期:2013.5.3
Imidazo[1,5-a]azines are synthesized in moderate to excellent yields using a mild cyclodehydration/aromatization reaction triggered by the use of triflic anhydride (Tf2O) and 2-methoxypyridine (2-MeOPyr). Various substitution patterns and functional groups were found to be compatible under the optimized conditions. In addition, a 5-bromo-3-aryl derivative was also shown to be active in a Sonogashira
使用温和的环脱水/芳香化反应,通过使用三氟甲磺酸酐(Tf 2 O)和2-甲氧基吡啶(2-MeOPyr)引发,可以中等至极好的收率合成咪唑并[1,5- a ]嗪。发现各种取代模式和官能团在优化条件下是相容的。此外,还显示了5-溴-3-芳基衍生物在Sonogashira交叉偶联和直接芳基化反应中具有活性。叔酰胺与底物相容,可合成三氟甲磺酸咪唑并[1,5- a ]吡啶鎓。
Electrocatalytic Intermolecular C(sp<sup>3</sup>)–H/N–H Coupling of Methyl <i>N</i>-Heteroaromatics with Amines and Amino Acids: Access to Imidazo-Fused <i>N</i>-Heterocycles
作者:Peng Qian、Zicong Yan、Zhenghong Zhou、Kangfei Hu、Jiawei Wang、Zhibin Li、Zhenggen Zha、Zhiyong Wang
DOI:10.1021/acs.orglett.8b02578
日期:2018.10.19
An efficient NH4I-mediated intermolecular annulation of methyl N-heteroaromatics with amines/amino acids was developed by virtue of anodic oxidation, providing a variety of functionalized imidazo-fused N-heterocycles with good to excellent yields. The practicality of this protocol was demonstrated by the readily available starting materials, broad substrate scope, water tolerance, scalability, and
An iodine mediated regio-selective nitrosation of imidazo[1,5-a]N-heteroarenes is reported using TBN as nitroso source. This method afford synthetically useful and medicinally interesting 3-nitroso imidazo[1,5-a]N-heteroarenes in moderate to good yields with good functional group tolerance. Further, this reaction could applicable on gram-scale level synthesis.
碘介导的咪唑并[1,5- a ] N-杂芳烃的区域选择性亚硝化反应使用TBN作为亚硝基源。该方法以中等至良好的收率和良好的官能团耐受性提供了合成有用和医学上有趣的 3-亚硝基咪唑并 [1,5- a ] N-杂芳烃。此外,该反应可应用于克级合成。
Oxidative Copper‐Catalyzed Regioselective Trifluoromethylation of Fused Imidazo[1,5‐
<i>a</i>
]‐
<i>N</i>
‐heteroarenes using Langlois Reagent
A direct and catalytic method for the regioselective introduction of the medicinally interesting −CF3 group into fused imidazo[1,5‐a]‐N‐heteroarenes via an oxidative copper‐catalyzed C−H bond functionalization reaction has been developed. The reaction proceeds at room temperature using the cheap and stable Langlois reagent (NaSO2CF3) as a CF3 source.
已经开发了一种直接的催化方法,该方法通过氧化铜催化的CH键官能化反应将医学上有趣的-CF 3基团选择性引入稠合的咪唑并[1,5- a ] -N-杂芳烃中。反应使用便宜且稳定的Langlois试剂(NaSO 2 CF 3)作为CF 3源,在室温下进行。
Natural α-Amino Acids Applied in the Synthesis of Imidazo[1,5-<i>a</i>]N-heterocycles under Mild Conditions
作者:Qiang Wang、Shuai Zhang、Fengfeng Guo、Baiqun Zhang、Ping Hu、Zhiyong Wang
DOI:10.1021/jo302299u
日期:2012.12.21
A facile iodine-mediated decarboxylative cyclization from alpha-amino acids and N-heterocyclic carbaldehydes was developed. By virtue of this method, a series of imidazo[1,5-a]N-heterocycles can be synthesized efficiently under mild conditions. A tentative reaction mechanism was proposed based on the experimental results and previous reports.