Synthesis of Indazoles by the [3+2] Cycloaddition of Diazo Compounds with Arynes and Subsequent Acyl Migration
作者:Zhijian Liu、Feng Shi、Pablo D. G. Martinez、Cristiano Raminelli、Richard C. Larock
DOI:10.1021/jo702062n
日期:2008.1.1
The [3+2] cycloaddition of a variety of diazo compounds with o-(trimethylsilyl)aryl triflates in the presence of CsF or TBAF at room temperature provides a very direct, efficient approach to a wide range of potentially biologically and pharmaceutically interesting substituted indazoles in good to excellent yields under mild reaction conditions. Simple diazomethane derivatives afford N-unsubstituted
在室温下,在CsF或TBAF存在下,各种重氮化合物与邻-(三甲基甲硅烷基)芳基三氟甲酸酯的[3 + 2]环加成反应,提供了一种直接,有效的方法,可用于处理许多潜在的生物学和药学上令人关注的取代的吲唑在温和的反应条件下,收率好至极好。简单的重氮甲烷衍生物根据试剂的化学计量和反应条件而提供N-未取代的吲唑或1-芳基化的吲唑,而含二羰基的重氮化合物进行羰基迁移以选择性地提供1-酰基或1-烷氧基羰基的吲唑。