Process for preparing a purine derivative
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United States of America Patent
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Oct 11, 1988
Grant Date -
N/A
app pub date -
Jun 16, 1987
filing date -
Jun 27, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for the preparation of enprofylline is disclosed, which method comprises (a) treating 6-amino-1-n-propyl-2,4-(1H,3H)-pyrimidinedione in formic acid with sodium nitrite in the presence of a catalyst to the formation of 6-amino-5-formamido-1-n-propyl-2,4-(1H,3H)-pyrimidinedione and (b) performing a ring-closure reaction on the formed 6-amino-5-formamido-1-n-propyl-2,4-(1H,3H)-pyrimidinedione to the formation of 3,7-dihydro-3-n-propyl-1H-purin-2,6-dione.
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