Synthesis of 3,3-dichloro-2-oxindoles from isatin-3-p-tosylhydrazones and (dichloroiodo)benzene
作者:Charlotte Hepples、Graham K. Murphy
DOI:10.1016/j.tetlet.2015.06.063
日期:2015.8
Lewis base-catalyzed chlorination reaction that employs the hypervalent chlorinating agent PhICl2. The discovery of p-tosylhydrazones as chlorination precursors has expanded the functional group tolerance of the chlorination reaction to now include carbamates, acetamides, and sulfonates. Additionally, this allowed us to circumvent the use of the diazo group in our chlorination reaction, and offers
An efficacious method for the halogenation of β-dicarbonyl compounds under mildly acidic conditions
作者:Matthew L. Meketa、Yogesh R. Mahajan、Steven M. Weinreb
DOI:10.1016/j.tetlet.2005.05.055
日期:2005.7
be chlorinated in high yields using sodium hypochlorite in a 5:2 mixture of acetone/acetic acid at 0 °C for 1 h. Similarly, bromination of these dicarbonyl substrates can be accomplished under the same conditions using sodium hypobromite.
SO<sub>2</sub>ClF: A Reagent for Controllable Chlorination and Chlorooxidation of Simple Unprotected Indoles
作者:Tianting Ma、Yu Zheng、Shenlin Huang
DOI:10.1021/acs.joc.3c00039
日期:——
Sulfuryl chlorofluoride was first employed as a versatile reagent for controllable chlorination and chlorooxidation of simple unprotected indoles. Three types of products including 3-chloro-indoles, 3-chloro-2-oxindoles, and 3,3-dichloro-2-oxindoles could be selectively obtained in good to excellent yields by switching the reaction solvents. The present method features easy-to-operate, broad substrate
Controllable transformation of indoles using iodine(<scp>iii</scp>) reagent
作者:Yinxiang Jian、Peng Liang、Xiaoyan Li、Huawu Shao、Xiaofeng Ma
DOI:10.1039/d2ob01951e
日期:——
combination of phenyliodinebis(trifluoroacetate) (PIFA) with n-Bu4NCl·H2O (TBAC) was exploited. Through controlling the amount of PIFA and TBAC from one to three equivalents, 3-chloro-indoles, 3-chloro-2-oxindoles, and 3,3-dichloro-2-oxindoles were obtained, respectively, in satisfactory to excellent yields. The advantages of the protocol include mild conditions, facile process with short reaction time, high
Environmentally friendly and highly regioselective C-3 dichlorination and C-2 oxidation of N-substituted indoles have been established using NaCI as a chlorine source and H2O as an oxygen source. A series of 3,3-dichloro-2-oxindoles were obtained in moderate to excellent yields. The gram-scale synthesis and derivatization reaction were explored. The possible mechanism for this reaction was elucidated.