Chemistry of Heterocyclic Compounds p. 238 - 241 (2002)
Update date:2022-08-04
Topics:
Mkrtchyan
Noravyan
Petrosyan
A method has been developed for the preparation of 2-R-substituted 3-amino-6,6-dimethyl-5,6-dihydro-8H-pyrano[4′,3′:4,5]thieno[2, 3-d]pyrimidin-4-ones based on 2-R-amino-3-ethoxycarbonylpyrano-[2,3-c]thiophenes. It has been established that their cyclization with hydrazine hydrate requires vigorous conditions.
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