Transition-Metal-Free Synthesis of Oxindoles by Potassium tert-Butoxide-Promoted Intramolecular α-Arylation
摘要:
Potassium tert-butoxide-mediated intramolecular alpha-arylations of fluoro- and chloro-substituted anilides provide oxindoles in DMF at 80 degrees C. In this manner, diversely substituted products have been obtained in moderate to high yields.
Transition-Metal-Free Synthesis of Oxindoles by Potassium tert-Butoxide-Promoted Intramolecular α-Arylation
摘要:
Potassium tert-butoxide-mediated intramolecular alpha-arylations of fluoro- and chloro-substituted anilides provide oxindoles in DMF at 80 degrees C. In this manner, diversely substituted products have been obtained in moderate to high yields.
An efficient heterogeneous copper-catalyzed cyclization of o-haloanilides and metalsulfides has been achieved via the C–S coupling in DMF at 80 or 140 °C in the existence of an MCM-41-bound NHC-Cu(I) catalyst and then intramolecular condensation, delivering a wide range of substitutedbenzothiazoles in mostly good to high yields. This new MCM-41-NHC-CuI complex can facilely be obtained by a two-step