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Synthesis 1990; 1990(7): 587-589
DOI: 10.1055/s-1990-26949
DOI: 10.1055/s-1990-26949
paper
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A New Route to 2,5-Diamino-4,6-dichloropyrimidine, A Key Precursor of 9-Substituted Guanines
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Publication History
Publication Date:
17 September 2002 (online)
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An improved synthesis of 2,5-diamino-4,6-dihydroxypyrimidine (7) is reported. The direct chlorination of 7 provides the shortest (2 step) synthesis of 2,5-diamino-4,6-dichloropyrimidine (5) reported to date. The procedure described here affords an easy approach to 5, a key intermediate to various 9-substituted guanines.