Efficient Syntheses of β-Amino-<i>N</i>-acylbenzotriazoles and Cinnamides through Regioselective 1,4- or 1,2-Addition of Amines to<i>N</i>-Cinnamoylbenzotriazoles
作者:Xiaoxia Wang、Xuefei Zou、Jian Li、Qinghong Hu
DOI:10.1055/s-2005-921918
日期:——
Amines react with N-cinnamoylbenzotriazoles to afford either β-amino-N-acylbenzotriazoles or cinnamides depending on the structure of the amines. Aromatic amines react with N-cinnamoylbenzotriazoles via 1,4-addition to give β-amino-N-acylbenzotriazoles in good yields. For o-phenylenediamine, the 1,4-addition products were further acylated to provide a facile route to substituted 1,3,4,5-tetrahydro-1,5-benzodiazepine-2-ones. Aliphatic amines, however, react exclusively through the 1,2-addition pathway to produce cinnamides in good yields.
根据胺的结构,胺与 N-肉桂酰基苯并三唑反应可生成δ-氨基-N-酰基苯并三唑或肉桂酰胺。芳香胺与 N-肉桂酰基苯并三唑通过 1,4-加成反应生成δ-氨基-N-酰基苯并三唑,产率高。对于邻苯二胺,1,4-加成产物可进一步酰化,从而为获得取代的 1,3,4,5-四氢-1,5-苯并二氮杂卓-2-酮提供了便捷的途径。然而,脂肪族胺只能通过 1,2-加成途径进行反应,从而以良好的产率生成肉桂酰胺。