74897-45-3Relevant academic research and scientific papers
Direct N-Alkylation and Kemp Elimination Reactions of 1-Sulfonyl-1H-Indazoles
Tang, Meng,Chu, Bingjie,Chang, Xiaowei
, p. 2109 - 2116 (2018/07/31)
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 method was successfully applied to the total syntheses of quindolinone and cryptolepinone; quindolinone was prepared in a one-pot reaction from 1-sulfonyl-1H-indazole.
Tricyclic Systems Obtained from Some 3-Aminobenzothiophen Derivatives
Clarke, Kenneth,Fox, William Richard,Scrowston, Richard M.
, p. 833 - 847 (2007/10/02)
4-Hydroxybenzothienopyridin-2(1H)-one (3) was obtained by cyclisation of a benzothiophen derivative containing either 2-CO2Et, 3-NH.CO.CH2.CO2Et or 2-CO.CH2.CO2Et, 3-NH2 substituents. 3-Amino-2-formyl-, 3-amino-2-acetyl-, and 3-amino-2-acetyl-5-nitro-benzothiophens were converted into the corresponding 3-thiocyanato-compounds, which gave tricyclic systems when treated with hydroxylamine.Heating these with polyphosphoric acid gave benzothienoisothiazole, and its 3-methyl and 3-methyl-7-nitro-derivatives respectively.Nitration, formylation, and oxidation reactions of 3-methylbenzothienoisothiazole have been investigated.
