Direct N-Alkylation and Kemp Elimination Reactions of 1-Sulfonyl-1<i>H</i>
-Indazoles
作者:Meng Tang、Bingjie Chu、Xiaowei Chang
DOI:10.1002/asia.201800741
日期:2018.8.16
The reactions of 1‐sulfonyl‐1H‐indazoles under basic conditions are discussed, and the direct N‐alkylation and Kemp elimination reactions of these compounds are reported. A series of 2‐(p‐tosylamino)benzonitriles and N‐alkyl indazoles were prepared in good yields. Moreover, the 2‐(p‐tosylamino)benzonitriles could be transformed into a diverse range of important derivatives in a one‐pot reaction. This
申请人:Sumitomo Chemical Takeda Agro Company, Limited
公开号:EP1174028B1
公开(公告)日:2004-12-22
Detosylation of 3-amino-1-tosylindole-2-carbonitriles using DBU and thiophenol
作者:Sophia S. Michaelidou、Panayiotis A. Koutentis
DOI:10.1016/j.tet.2010.02.058
日期:2010.4
Attempted detosylation of the 3-amino-1-(p-tosylamino)indole-2-carbonitriles 4a-c using either K2CO3 in EtOH or DBU in PhH at reflux gives unexpectedly the 3-(N-p-tosylamino)indole-2-carbonitriles 5a-c, respectively in high yields. Nevertheless, treatment of 1-(p-tosylamino)indoles 4a-c with thiophenol and DBU in PhH at reflux gives the detosylated 3-aminoindole-2-carbonitriles 5a-c. Reaction mechanisms supporting the tosyl migration (4 -> 5) and the reductive detosylation (4 -> 2) are proposed. All new compounds are fully characterised. (C) 2010 Elsevier Ltd. All rights reserved.