Versatile three-component synthesis of 2′-amino-1,2-dihydrospiro[(3H)-indole-3,4′-(4′H)-pyran]-2-ones
作者:V. Yu. Mortikov、Yu. M. Litvinov、A. A. Shestopalov、L. A. Rodinovskaya、A. M. Shestopalov
DOI:10.1007/s11172-008-0338-7
日期:2008.11
2-dihydrospiro[(3H)-indole-3,4′-(4′H)-pyran]-2-ones has been suggested consisting in the three-component reaction of isatins, cyanoaceticacid derivatives, and α-methylenecarbonyl compounds (β-dicarbonyl compounds, activated phenols, and OH-substituted heterocycles) in ethanol in the presence of triethylamine as a catalyst. The reaction proceeds selectively to form spiro[(3H)-indole-3,4′-(4′H)-pyrans].
Base free synthesis of iron oxide supported on boron nitride for the construction of highly functionalized pyrans and spirooxindoles
作者:Aniruddha Molla、Sahid Hussain
DOI:10.1039/c5ra21969h
日期:——
BN@Fe3O4 network was synthesized via chemical reduction followed by aerial oxidation in absence of base and was subsequently used for the synthesis of highly functionalized pyrans and spirooxindoles derivatives on water.
An efficient and simple synthetic approach has been developed for the preparation of biologically interesting spiro[oxindole-3,4'-(4′H-pyran)] derivatives via visible light-mediated one-pot, three-component reaction of isatins, 1,3-dicarbonylcompounds and malononitrile by using an inexpensive organic dye, Na2 eosin Y, as the photocatalyst in aqueous ethyl lactate at ambient temperature. The substrate