Pyrimidinethiones as Building Blocks in Heterocyclic Synthesis: Synthesis of Pyrano[2,3-D]pyrimidine, Chromeno[2,3-D]pyrimidine, Pyrido[3',2':5,6]pyrano[2,3-B]pyridine and Pyrimido[5',4':5,6]pyrano[2,3-D]pyrimidine

Sinai Journal of Applied Sciences

doi 10.21608/sinjas.2014.78457