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.
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