A. N. Grinev and N. V. Kaplina,"Transformations of 5-methyl-6-carbethoxy-3,4-dihydrothieno-[2,3-d]pyrimidine for synthesis of 4-methoxy-, 4-alkylamino-, and other derivatives of thieno[2,3-d]pyrimidine", Chemistry of Heterocyclic Compounds, 1985, Vol 21, Number 7, Pages 767-770.
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dx.doi.org/10.1007/BF00519143
