Synthesis of Polycyclic Nitrogen-containing Heterocycles: One Pot Formation of 1,6-Naphthyridine Ring System by Reaction of Amino-cycano-methylyhio-heterocycles with Dialkyl Acetylenedicarboxylates
作者:Yoshinori Tominaga、Noriko Yoshioka
DOI:10.3987/com-95-s13
日期:——
The reaction of 5-amino-6-cyano-1,3-dimethyl-7-methylthiopyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione (1c) with dimethyl acetylenedicarboxylate (DMAD) in the presence of potassium carbonate in dimethyl sulfoxide gave tetramethyl 8,9,10,11-tetrahydro-8,10-dimethyl-9,10-dioxo-4H-pyrimido[4',5':5,6]pyrido[2,3,4-cb][1,6]naphthyridine-2,3,5,6-tetracarboxylate (2c). The reaction of other heterocycles bearing amino, cyano, and methylthio groups with DMAD or DEAD under the same reaction conditions gave the corresponding tetracyclic heterocycles containing the fundamental 1,6-naphthyridine ring system.