K. Majumdar, T. Bhattacharyya
Nov 6, 2001
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ChemInform
Abstract
Synthesis 2001, No. 10, 30 07 2001. Article Identifier: 1437-210X,E;2001,0,10,1568,1572,ftx,en;Z03001SS.pdf. © Georg Thieme Verlag Stuttgart · New York ISSN 0039-7881 Abstract: A number of 1,3-dimethyl-6-[methyl(4-aryloxybut-2ynyl)amino]pyrimidine-2,4(1H,3H)-diones 4a–i were synthesised in 69 to 80% yields by the reaction of 6-chloro-1,3-dimethyluracil (6-chloro-1,3-dimethylpyrimidine-2,4(1H,3H)-diones) and 1-aryloxy-4-N-methylaminobut-2-yne in refluxing ethanol for 12 hours. The tertiary amines 4a–i were then heated in refluxing 1,2-dichlorobenzene for 17 hours to give 5-[(E)-aryloxymethylidene]-1,3,8trimethyl-5,6,7,8-tetrahydropyrido[2,3-d]pyrimidine-2,4(1H,3H)diones 5a–i in 55 to 75% yields.