Catalyst- and chromatography-free synthesis of pyrrole-substituted indolinone derivatives in water
摘要:
Pyrrole-substituted indolinone derivatives were synthesized by the reaction of 4-hydroxyproline and isatin derivatives in water under catalyst-free conditions. The main advantages of this protocol besides the use of water as a solvent include short reaction time, practical simplicity, and high yield. (C) 2014 Elsevier Ltd. All rights reserved.
Sequential Nucleophilic <i>C</i>
(sp<sup>3</sup>
)-Benzylation/C(sp<sup>2</sup>
)-H Arylation for the Synthesis of Spiro[oxindole-3,5′-pyrrolo[2,1-<i>a</i>
]isoquinolines]
using sequential nucleophilic C(sp3)-benzylation and palladium-catalyzedC(sp2)–H arylation reactions of 3-pyrrolyloxindoles and 2-(bromomethyl)aryl bromides, a series of spiro[oxindole-3,5′-pyrrolo[2,1-a]isoquinolines] were smoothly obtained in up to 92 % yield. A synthetic application of this method was also demonstrated by the transformation of 3u into functionalized compound 4. Moreover, the catalytic