Regioselective mono-aza-Michael additions of divinyl ketones with 3-(arylimino)indolin-2-ones: Synthesis of N-enone-functionalized 3-(arylimino)indolin-2-ones
作者:Xiao Chen、Zheng Li
DOI:10.1177/1747519820920179
日期:2020.11
Selective mono-aza-Michael additions of divinyl ketones with 3-(arylimino)indolin-2-ones in the presence of cesium carbonate are described. N-Enone-functionalized 3-(arylimino)indolin-2-ones were efficiently synthesized in satisfactory yield. The salient features of this protocol are high regioselectivity, high yield, and mild conditions.
A zinc‐mediated α‐selective prenylation of isatin‐derived imine in a sealed tube has been developed. The method is highly efficient and operationally simple with its use of readily available prenyl bromide as the prenyl source. The obtained prenylated adduct can be further manipulated to other more complicated derivatives through cyclization or oxidation.
Synthesis of 1′-aryl-2′-(2-oxoindolin-3-yl)spiro[indoline-3,5′-pyrroline]-2,3′-dione via one-pot reaction of arylamines, acetone, and isatins
作者:Yan Sun、Jing Sun、Chao-Guo Yan
DOI:10.1016/j.tetlet.2012.05.023
日期:2012.7
An efficient synthetic method for 1′-aryl-2′-(2-oxoindolin-3-yl)spiro[indoline-3,5′-pyrroline]-2,3′-diones was successfully developed via the one-pot domino reaction of arylamines, acetone, and isatins in acetic acid. The reaction mechanism involved the sequential Michael addition and ring closure of the in situ formed 3-N-aryliminoisatin and isatylidene acetone.
“On water” synthesis of spiro-indoles via Schiff bases
作者:Siva S. Panda、Subhash C. Jain
DOI:10.1007/s00706-011-0697-x
日期:2012.8
AbstractA fast, efficient, and clean “on water” synthesis of new Schiffbases and their conversion to spiro compounds undermicrowaveirradiation, as well as in water, is reported. Indol-2,3-diones were reacted separately with various heterocyclic and aromatic amines in water at room temperature to obtain corresponding Schiffbases in high purity and yield. These were then converted into corresponding
Catalyst‐free straightforward synthesis of 3‐cyano‐3‐arylamino‐2‐oxindoles through hydrocyanation with benzoyl cyanide
作者:Xiao Chen、Zheng Li
DOI:10.1002/jhet.3809
日期:2020.2
The effective hydrocyanation of 3‐(arylimino)indolin‐2‐ones with benzoyl cyanide under catalyst‐free condition at room temperature to synthesize 3‐cyano‐3‐arylamino‐2‐oxindoles is described. This protocol benefits from low toxicity, inexpensive, and easy‐to‐handle cyanating agent, no catalysts, no additives, mild conditions, good substrate tolerance, and simple work‐up procedure. This reaction successfully