Chemoselective Reduction of Some Condensates derived from Chromone-3-carbaldehyde using Sm and Zn
摘要:
Condensates 4-6 undergo reductive dimerization with Sm in THF containing aqueous NH4Cl to produce 7-9, whereas with Zn under similar reaction condition 3-5 produce 10-12.
Cascade reactions between 2-substituted-3-(4-oxo-4H-chromen-3-yl)acrylonitriles with benzylamine and p-toluidine
作者:Magdy A. Ibrahim、Al-Shimaa Badran
DOI:10.24820/ark.5550190.p010.745
日期:——
Abstract Chemical transformations of the simple condensation products derived from 3-formylchromone and some active methylene compounds, was achieved by reaction with nucleophilicreagents namely benzylamine and p-toluidine to produce either 2-iminopyrane or pyrano[3,2-c]chromene derivatives. These transformations initially proceed through nucleophilic attack at C-2 of the γ–pyrone ring with concomitant
Thermal rearrangement of 4-cyano-2,3-dihydro-5-ethoxy-3-methyl-3-(4-oxo-4H-1- benzopyran-3-yl)furans: a reversed alkoxycarbonylcyclopropane ? 5-alkoxy-2,3-dihydrofuran transformation
作者:Chandra Kanta Ghosh、Subhabrata Biswas
DOI:10.1039/c39890001784
日期:——
The title dihydrofurans (3f, R1= H, Me, and Cl), prepared from the α-cyano-ester (1e) and diazomethane, thermallyrearrange to the cyclopropanes (4f) in predominantly Z-isomeric form.