Mahsa Mahpeyma* - Department of Organic Chemistry, Karaj Branch, Islamic Azad university, Karaj, Iran;
Bita Mohtat - Department of Organic Chemistry, Karaj Branch, Islamic Azad university, Karaj, Iran;

The reactive intermediate generated by the addition of tert-butyl and ۱,۱,۳,۳-tetramethyl butylisocyanide and cyclohexyl isocyanide to dialkyl acetylenedicarboxylate was trapped by ۳-hydroxy pyridine to produce highly functionalized ۴H-chromenes in fairly good yields.

۳-hydroxy pyridine , dialkyl acetylene dicarboxylates ,alkyl isocyanide ,multicomponent reaction,۴H-chromenes