Construction of 1H-indazoles from ortho-aminobenzoximes by the Mitsunobu reaction
作者:Ivie L. Conlon、Katie Konsein、Yulemni Morel、Alexandria Chan、Steven Fletcher
DOI:10.1016/j.tetlet.2019.07.020
日期:2019.9
ortho-aminobenzoximes to Mitsunobu conditions will likewise induce a cyclodehydration to deliver the corresponding 1H-indazoles. Indeed, secondary anilines afforded the predicted N1-substituted 1H-indazoles, and primary anilines, after activation with a Boc group, furnished the N1-Boc 1H-indazoles in good to excellent yields. This work further expands the chemical repertoire of the Mitsunobu reaction, representing
近来,在药物发现中吲唑基序的出现已经激增。因此,文献中出现了更新,更温和和更有效的合成途径。最近,我们报道了水延醛肟的Mitsunobu引发的环脱水反应,以生成瞬态1,2-苯并恶唑,水杨基异羟肟酸触发了其相应的3-羟基苯并恶唑。我们假设使邻氨基苯甲酸酯经受Mitsunobu条件同样会引起环脱水作用,从而释放出相应的1 H-吲唑。实际上,仲苯胺提供了预期的N 1-取代的1 H-吲唑,而伯苯胺在被Boc基团激活后提供了N 1-Boc 1 H-吲唑的收率良好至极佳。这项工作进一步扩大了Mitsunobu反应的化学组成,代表了其在1 H-吲唑核结构中的空前应用。