A General One-Pot Synthesis of 2<i>H</i>
-Indazoles Using an Organophosphorus-Silane System
作者:Jens Schoene、Hassen Bel Abed、Peter Schmieder、Mathias Christmann、Marc Nazaré
DOI:10.1002/chem.201800763
日期:2018.6.26
A simple and direct approach for the regioselective construction of the privileged 2H‐indazole scaffold is described. The developed one‐pot strategy involves phospholene‐mediated N−N bond formation to access 2H‐indazoles. The amount of organophosphorus reagent was minimized by recycling the phospholene oxide with organosilane reductants. Starting from functionalized 2‐nitrobenzaldehydes and primary
描述了一种简单而直接的方法来进行特权2 H-吲唑支架的区域选择性构建。发达的一锅策略涉及通过磷烯介导的N-N键的形成来获得2 H-吲唑。通过使磷烯氧化物与有机硅烷还原剂一起循环使用,可最大程度地减少有机磷试剂的用量。从官能化的2-硝基苯甲醛和伯胺开始,温和的还原环化(包括使用市售的磷烯氧化物和硅烷)可提供各种取代的2 H-吲唑,收率良好至优异。