Synthesis of (2
<i>H</i>
)‐Indazoles from Azobenzenes Using Paraformaldehyde as a One‐Carbon Synthon
作者:Rina Chun、Saegun Kim、Sang Hoon Han、Sangil Han、Suk Hun Lee、Neeraj Kumar Mishra、Young Hoon Jung、Hyung Sik Kim、In Su Kim
DOI:10.1002/adsc.201801547
日期:2019.4
hydroxymethylation followed by intramolecular annulation of azobenzenes using paraformaldehyde as a valuable C1‐feedstock is described. The method is readily extended to the coupling reaction between azobenzenes and trifluoroacetaldehyde. This transformation efficiently produces a range of C3‐unsubstituted and C3‐trifluoromethylated (2H)‐indazoles, which are important targets in the development of novel
描述了铑(III)催化的羟甲基化,然后使用多聚甲醛作为有价值的C1原料进行偶氮苯分子内环氧化。该方法很容易扩展到偶氮苯和三氟乙醛之间的偶联反应。这种转化有效地产生了一系列C3未取代和C3三氟甲基化(2 H)-吲唑,它们是开发新型生物活性化合物的重要目标。观察到优异的化学选择性和官能团耐受性。C3-未取代的(2 H)-吲唑的合成转化突出了该开发方法的实用性。