Base-promoted ring opening of 3-chlorooxindoles for the construction of 2-aminoarylthioates and their transformation to quinazolin-4(3<i>H</i>)-ones
作者:Tej Narayan Poudel、Hari Datta Khanal、Yong Rok Lee
DOI:10.1039/c8nj00195b
日期:——
Cesium carbonate-promoted synthesis of diverse 2-aminoarylthioatesviaring opening of 3-chlorooxindoles with thiols, and their synthetic applications is demonstrated.
A novel methodology for the efficient synthesis of 3-monohalooxindoles by acidolysis of 3-phosphate-substituted oxindoles with haloid acids
作者:Li Liu、Yue Li、Tiao Huang、Dulin Kong、Mingshu Wu
DOI:10.3762/bjoc.17.150
日期:——
A novel method for the synthesis of 3-monohalooxindoles by acidolysis of isatin-derived 3-phosphate-substituted oxindoles with haloid acids was developed. This synthetic strategy involved the preparation of 3-phosphate-substituted oxindole intermediates and SN1 reactions with haloid acids. This new procedure features mild reaction conditions, simple operation, good yield, readily available and inexpensive
开发了一种通过用卤代酸酸解靛红衍生的 3-磷酸取代 oxindoles 来合成 3-monohalooxindoles 的新方法。该合成策略涉及制备 3-磷酸取代的羟吲哚中间体以及与卤酸的S N 1 反应。该新工艺具有反应条件温和、操作简单、收率好、原料易得且价格低廉、克级规模化等特点。
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
Solvent‐free Darzens condensation of
<scp>3‐</scp>
chlorooxindoles with aryl aldehydes for diastereoselective construction of spiro‐epoxyoxindoles by grinding
A highlyefficient, diastereoselective strategy for the synthesis of aryl-substituted spiro-epoxyoxindole derivatives by a Darzens-type reaction of α-chlorooxindoles with aryl aldehydes in the presence of bases under solvent-free grinding conditions has been developed. The process features with easy work-up, mildreaction condition, high to excellent diastereoselectivitie and yields as well as environmental
Formal [4+1] annulations of salicylaldehydes with <scp>3‐chlorooxindoles</scp> for diastereoselective construction of dihydrobenzofuranspirooxindoles by solvent‐free grinding
A highly diastereoselective solvent-free grinding approach for the construction of dihydrobenzofuranspirooxindole derivatives through a formal [4+1] annulations of α-chlorooxindoles with salicylaldehydes in the presence of Brønsted base is reported. This transformation proceeds by Darzens-type epoxidation to give trans-form spiro-epoxyoxindoles, followed by the nucleophilic ring-opening/an intramolecular