Synthesis of 3-aminooxindoles via acid-promoted cyclization of α-imino-N-arylamides and α-azido-N-arylamides
作者:Dianjun Li、Haichao Ma、Wei Yu
DOI:10.1016/j.tet.2015.12.054
日期:2016.2
This paper reports a new method for the synthesis of 3-aminooxindole derivatives. Ethyl 2-(N-arylcarbamoyl)-2-iminoacetates, which can be prepared from the reaction of α-ethoxycarbonyl-α-bromo-N-phenylacetamides with sodium azide, were found to undergo Friedel–Crafts cyclization to afford 3-aminooxindoles in high yield by the catalysis of an acid such as BF3⋅OEt2. α-Aryl-α-azido-N-arylamides, on the
本文报道了一种合成3-氨基羟吲哚衍生物的新方法。发现可以通过α-乙氧基羰基-α-溴-N-苯基乙酰胺与叠氮化钠反应制得的2-(N-芳基氨基甲酰基)-2-亚氨基乙酸乙酯经过Friedel-Crafts环化反应,得到3-氨基氧吲哚。高收率由酸如BF的催化作用3 ⋅OEt 2。另一方面,α-芳基-α-叠氮基-N-芳基酰胺在三氟甲磺酸的作用下通过串联的1,2-芳基迁移-二硝基化和环化转化为3-芳基氨基羟吲哚。2-(N-芳基氨基甲酰基)-2-亚氨基乙酸乙酯和α-芳基-α-叠氮基-N-芳基酰胺很容易获得,目前的反应有望用于合成3-氨基羟吲哚衍生物。