Helvetica Chimica Acta p. 797 - 803 (1990)
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Condensation of 2-aminothiophene-3-carbonitrile (4) with guanidine or sequential addition of CS2 and NH3 to 4 provides 2,4-diaminothieno[2,3-d]pyrimidine (7). This compound yields, after sequential addition of sec-BuLi and either [3-
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