Potassium Carbonate → 2-Amino-3-cyano-4-methyl-5-ethynylpyridine

HRID 1734186Notes

Reaction equation

HRID 1734186 reaction equation
[NH2:1][C:2]1[C:7]([C:8]#[N:9])=[C:6]([CH3:10])[C:5]([C:11]#[C:12][Si](C)(C)C)=[CH:4][N:3]=1.C(=O)([O-])[O-].[K+].[K+]>CO>[NH2:1][C:2]1[C:7]([C:8]#[N:9])=[C:6]([CH3:10])[C:5]([C:11]#[CH:12])=[CH:4][N:3]=1

Participants

4

Reactant 2

HCID 11430Potassium CarbonateHCID 197071982-Amino-3-cyano-4-methyl-5-(trimethylsilylethynyl)pyridine

Product 1

HCID 233567022-Amino-3-cyano-4-methyl-5-ethynylpyridine

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

In another variation in the method to the 2,4-diamino-5,6-disubstituted-5-deazapteridines described above, 2-amino-3-cyano-5-iodo-4-methylpyridine is reacted with trimethylsilylacetylene in the presence of copper(I) iodide and bis(triphenylphosphine)palladium(II) chloride under basic conditions in acetonitrile, affording 2-amino-3-cyano-4-methyl-5-(trimethylsilylethynyl)pyridine. The 5-(trimethylsilylethynyl)pyridine is in turn treated with potassium carbonate in methanol, yielding the corresponding 2-amino-3-cyano-4-methyl-5-ethynylpyridine. The 5-ethynylpyridine is then reacted with an appropriately substituted halide, for example, 4-trifluoromethyl-phenyl iodide, again in the presence of copper(I)iodide and bis(triphenylphosphine)palladium(II) chloride under basic conditions in acetonitrile, yielding a 2-amino-3-cyano-4-methyl-5-(substituted-ethynyl)pyridine, for example, 2-amino-3-cyano-4-methyl-5-[(4-trifluoromethylphenyl)ethynyl]-pyridine. The so-prepared pyridine is then cyclized and hydrohalogenated with chloroformamidine hydrochloride in diglyme, affording the corresponding 2,4-diamino-5-methyl-6-[1-chloro-2-substituted-ethenyl]-5-deazapteridine, for example, 2,4-diamino-5-methyl-6-[1-chloro-2-(4-trifluoromethylphenyl)ethenyl]-5-deazapteridine. Cyclizations with an appropriately substituted 2-amino-3-cyanopyridine and chloroformamidine hydrochloride in diglyme are taught by N. V. Harris et al (J. Med. Chem. 1990, 33, 434-444). Example 10 provides a detailed description of how this reaction is conducted.

Sources & evidence

ORD record
ord-a577ef53f8b24b7db52f43eed1ba11e6
Source dataset
uspto-grants-1996_07
Patent number
US05532370

Reaction notes

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