3-Amino-2,1-benzoisothiazole. Synthesis of some chloro and trifluoromethyl derivatives
作者:J. Gray、D. R. Waring
DOI:10.1002/jhet.5570170113
日期:1980.1
The syntheses of the 7-chloro-, 4,7-dichloro-, 5- and 7-trifluoromethyl, 5-chloro-6-trifluoro-methyl- and 5-chloro-7-trifluoromethyl- derivatives of 3-amino-2,1-benzoisothiazole are described. Preparative details are included for a number of the precursors to the benzoisothiazole derivative which have not previously been described. Visible spectra of some azo dyes prepared from the title compounds
Synthesis of Isatin 3-Oximes from 2-Nitroacetanilides
作者:Timothy Kearney、Philip A. Harris、Arthur Jackson、John A. Joule
DOI:10.1055/s-1992-26223
日期:——
2-Nitroacetanilides, prepared by alkaline hydrolysis of 1-arylamino-1-methylthio-2-nitroethenes, are converted into isatin (1H-indole-2,3-dione) 3-oximes by treatment with concentrated sulfuric acid or trifluoromethanesulfonic acid at room temperature.
Hydropyrrolo[2,3-b]indole is a privileged indoline motif, while its analogue, hydropyrrolo[3,2-b]indole, has been much less explored. Herein, we developed a cascade reaction of oxindole-derived nitrones with allenoates, providing straightforward access to the tetracyclic hydropyrrolo[3,2-b]indole scaffolds. Formation of multiple C–C/C–X bonds and cleavage could be achieved within one synthetic step
Hydropyrrolo[2,3- b ]indole 是一种特殊的二氢吲哚基序,而其类似物 hydropyrrolo[3,2- b ]indole 则鲜为人知。在此,我们开发了羟吲哚衍生的硝酮与联烯酸酯的级联反应,提供了四环氢吡咯并 [3,2- b ] 吲哚支架的直接途径。多个 C-C/C-X 键的形成和裂解可以在温和条件下使用一种简单的催化剂 (Gimeracil) 在一个合成步骤中实现。反应途径可能涉及作为关键中间体的螺氢氮杂酮的产生。
Pronounced ionic liquid effect in the synthesis of biologically active isatin-3-oxime derivatives under acid catalysis
作者:Angelo C. Pinto、Alexandre A. Moreira Lapis、Barbara Vasconcellos da Silva、Renato S. Bastos、Jaïrton Dupont、Brenno A.D. Neto
DOI:10.1016/j.tetlet.2008.07.067
日期:2008.9
An efficient method was developed for the preparation of isatin-3-oxime derivatives with Bronsted and/ or Lewis acids in irniclazoliurn-based ionic liquids. Isatin-3-oxime bearing the electron donating methoxy group was equally obtained in good yields.The pronounced ionic liquid effect avoids the direct forniation of isatin in the acidified media and the reaction leads exclusively to isatin-3-oxime derivatives. 0 2008 Elsevier Ltd. All rights reserved.
GRAY J.; WARING D. R., J. HETEROCYCL. CHEM., 1980, 17, NO 1, 65-67