[N+:1]([C:4]1[C:5]([NH:10][C:11]2[CH:16]=[CH:15][C:14]([OH:17])=[CH:13][CH:12]=2)=[N:6][CH:7]=[CH:8][CH:9]=1)([O-])=O.C([O-])=O.[NH4+].C(C1C=CC=C(C(C)(C)C)C=1O)(C)(C)C>CN(C=O)C>[NH2:1][C:4]1[C:5]([NH:10][C:11]2[CH:16]=[CH:15][C:14]([OH:17])=[CH:13][CH:12]=2)=[N:6][CH:7]=[CH:8][CH:9]=1A mixture of EXAMPLE 1 (41.05 Kg) and ammonium formate (5 equivalents), with or without 2,6-di-tert-butylphenol antioxidant, was treated with a mixture of 50% wet 5% palladium hydroxide on carbon (7% by weight per weight of EXAMPLE 1), in DMF (6 mL/g catalyst) then DMF (total DMF volume: 5 mL/g EXAMPLE 1) first with moderate agitation to control an exotherm (typically peaking at 85° C.) then with increased agitation for 1 hour (incomplete reactions were treated with additional catalyst/DMF mixture), cooled to 10° C., and filtered. The filtrant was washed with DMF (0.4 mL/g EXAMPLE 1), and the filtrate was added to water (29.4 mL/g EXAMPLE 1) at 10° C. to precipitate a solid which was filtered, washed with water (7.5 mL/g EXAMPLE 1), partially dried under a nitrogen stream, and further dried under vacuum at 50° C. to about 0.5% moisture.
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