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- W1521284672 abstract "The ketoketene-S,S-acetals (5a–c) react with guanidine and thiourea in the presence of alcoholic sodium alkoxides to give 2-amino- and 2-mercapto-4-alkoxy-5-aryl-6-methyl-pyridimidines (6a–k) respectively in good yields. The α-cyanoketene-S,S-acetals (9a–d) similarily gave 5-substituted-2,4-diamino-6-alkoxy-pyridimidines (10a–e) with guanidine in 50–60% overall yields. The unexchanged 2,4-diamino-5-p-chlorophenyl-6-methylthio-pyrimidine (11) was prepared from 9c as a typical example using identifical conditions described for 7. The synthesis of 5,6-fused pyrimidines (14a–f), (19) and (23a–e) was also accomplished using the cyclic ketene-S,S-acetals (13a–c) and (22a–b). The present method is found to be more convenient and efficient than reported methods for alkoxy and methylthiopyrimidines." @default.
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- W1521284672 title "Ketene-S,S-acetals-V" @default.
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- W1521284672 doi "https://doi.org/10.1016/0040-4020(76)85174-5" @default.
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