Water-Promoted Synthesis of 3,3′-Di(indolyl)oxindoles

REFERENCES

• (a) Sundberg , R. J. The Chemistry of Indoles ; Academic Press : New York , 1970 , 78 – 83 ; (b) Marion , L. The Alkaloids: Chemistry and Physiology ; Academic Press : New York , 1952 ; vol. 2 , pp. 371 – 481 .
   Google Scholar
• Bergman , J. ; Eklund , N. Synthesis and studies of tris-indolobenzenes and related compounds . Tetrahedron 1980 , 36 , 1445 – 1450 .
   Web of Science ®Google Scholar
• Ji , S.-J. ; Wang , S.-Y. Facile synthesis of 3,3-di(heteroaryl)indolin-2-one derivatives catalyzed by ceric ammonium nitrate (CAN) under ultrasound irradiation . Tetrahedron 2006 , 62 , 1527 – 1535 .
   Web of Science ®Google Scholar
• Azizian , J. ; Mohammadi , A. A. ; Karimi , A. R. ; Mohammadizadeh , M. R. KAl(SO4)2·12H2O as a recyclable Lewis acid catalyst for synthesis of some new oxindoles in aqueous media . J. Chem. Res., Synop. 2004 , 6 , 424 – 426 .
   Google Scholar
• Azizian , J. ; Mohammadi , A. A. ; Karimi , N. ; Mohammadizadeh , M. R. ; Karimi , A. R. Silica sulfuric acid: A novel and heterogeneous catalyst for the synthesis of some new oxindole derivatives . Catal. Commun. 2006 , 7 , 752 – 755 .
   Web of Science ®Google Scholar
• Yadav , J. S. ; Reddy , B. V. S. ; Gayathri , K. U. ; Meraj , S. ; Prasad , A. R. Bismuth(III) triflate–catalyzed condensation of isatin with indoles and pyrroles: A facile synthesis of 3,3-diindolyl- and 3,3-dipyrrolyloxindoles . Synthesis 2006 , 4121 – 4123 .
   Google Scholar
• (a) Deb , M. L. ; Bhuyan , P. J. An efficient and clean synthesis of bis(indolyl)methanes in a protic solvent at room temperature . Tetrahedron Lett. 2006 , 47 , 1441 – 1443 ; (b) Deb , M. L. ; Bhuyan , P. J. Uncatalyzed Michael addition of indoles: Synthesis of some novel 3-alkylated indoles via a three-component reaction in solvent-free conditions . Tetrahedron Lett. 2007 , 48 , 2159 – 2163 ; (c) Deb , M. L. ; Bhuyan , P. J. Uncatalysed Knoevenagel condensation in aqueous medium at room temperature . Tetrahedron Lett. 2005 , 46 , 6453 – 6456 ; (d) Deb , M. L. ; Baruah , B. ; Bhuyan , P. J. A Facile synthesis of 6,12-disubstituted 5,7-dihydroindolo[2,3-b]carbazoles from the reaction of 1H-indole and aldehydes catalyzed by molecular iodine . Synthesis 2008 , 286 – 292 ; (e) Deb , M. L. ; Bhuyan , P. J. An efficient method for the synthesis of indolo[3,2-b]carbazoles from 3,3′-bis(indolyl)methanes catalyzed by molecular iodine . Synlett 2008 , 3 , 325 – 328 .
   Web of Science ®Google Scholar