A new selective preparation of ethyl 7-a
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Yoichi Yamada; Heinosuke Yasuda; Yuichi Yoshihara; Kazue Yoshizawa
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Article
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1999
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Journal of Heterocyclic Chemistry
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English
⚖ 379 KB
## Abstract A series of ethyl 7‐amino‐2,4‐dioxopteridine‐6‐carboxylates 4 and ethyl 7‐amino‐4‐oxo‐2‐thioxopteridine‐6‐carboxylates 5, of interest biologically, has been prepared in one step from the reaction of such __vicinal__‐diamines as 1,3‐dialkyl‐5,6‐diaminouracils 2 or 1,3‐dialkyl‐5,6‐diamino