Furfurylamine → Furfurylamine

HRID 2181145Notes

Reaction equation

N[C:2]1[C:7]([OH:8])=[CH:6][C:5]([Br:9])=[CH:4][N:3]=1.[CH2:10]([NH2:16])[C:11]1[O:15][CH:14]=[CH:13][CH:12]=1>>[Br:9][C:5]1[CH:6]=[C:7]([OH:8])[CH:2]=[N:3][CH:4]=1.[CH2:10]([NH2:16])[C:11]1[O:15][CH:14]=[CH:13][CH:12]=1

Participants

Reactant 2

HCID 3438Furfurylamine

HCID 116940412-Amino-5-bromo-3-hydroxypyridine

Product 2

HCID 3438Furfurylamine

HCID 5995293-Bromo-5-hydroxypyridine

Procedure

In another example, 6-bromooxazolo[4,5-b]pyridine can be subjected to palladium-catalyzed coupling and deprotection of the resulting intermediate with trifluoroacetic acid. 6-Bromooxazolo[4,5-b]pyridine can be produced from 2-amino-5-bromo-3-pyridinol by condensation with formic acid or a trialkyl orthoformate, using methodology similar to that of Viaud et al., Heterocycles 41: 2799 (1995). The use of other carboxylic acids produces 2-substituted-6-bromooxazolo[4,5-b]pyridines, which are also substrates for the Heck and Sonogashira reactions. The synthesis of 2-amino-5-bromo-3-pyridinol proceeds from furfurylamine (Aldrich Chemical Company). Thus, 5-bromo-3-pyridinol (produced from furfurylamine according to U.S. Pat. No. 4,192,946) can be chlorinated, using methods described by Koch et al., Synthesis, 499 (1990), to give 2-chloro-5-bromo-3-pyridinol, which in turn can be converted to 2-amino-5-bromo-3-pyridinol by treatment with ammonia.

Sources & evidence

ORD record: ord-f881b005f49b4ed281ed33372f5eb92d
Source dataset: uspto-grants-2005_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06890935B2

Reaction notes

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