1-ethyl-4-hydrazino-1H-pyrazolo[3,4-b]pyridine-5-carboxylic acid, ethyl ester → 8-furfuryl-2-methyl-4H-pyrazolo[1,5-a]pyrazolo-[4',3':5,6]pyrido[3,4-e]pyrimidin-5(8H)-one

HRID 1834520

Reaction equation

HRID 1834520 reaction equation
[NH:1]([C:3]1[C:8]([C:9]([O:11]CC)=O)=[CH:7][N:6]=[C:5]2[N:14]([CH2:17][C:18]3[O:22][CH:21]=[CH:20][CH:19]=3)[N:15]=[CH:16][C:4]=12)[NH2:2].C([N:25]1[C:29]2=NC=[C:32](C(OCC)=O)[C:33](NN)=[C:28]2C=N1)C>>[CH2:17]([N:14]1[C:5]2[N:6]=[CH:7][C:8]3[C:9](=[O:11])[NH:25][C:29]4[N:1]([N:2]=[C:33]([CH3:32])[CH:28]=4)[C:3]=3[C:4]=2[CH:16]=[N:15]1)[C:18]1[O:22][CH:21]=[CH:20][CH:19]=1

Participants

3

Reactant 2

HCID 1623571-ethyl-4-hydrazino-1H-pyrazolo[3,4-b]pyridine-5-carboxylic acid, ethyl esterHCID 867354024-Hydrazino-1-furfurylpyrazolo[3,4-b]pyridine-5-carboxylic acid, ethyl ester

Product 1

HCID 1357053768-furfuryl-2-methyl-4H-pyrazolo[1,5-a]pyrazolo-[4',3':5,6]pyrido[3,4-e]pyrimidin-5(8H)-one

Procedure

By substituting 4-hydrazino-1-furfurylpyrazolo-[3,4-b]pyridine-5-carboxylic acid, ethyl ester for the 1-ethyl-4-hydrazino-1H-pyrazolo[3,4-b]pyridine-5-carboxylic acid, ethyl ester in Example 1 a and proceeding as in parts a and b, 8-furfuryl-2-methyl-4H-pyrazolo[1,5-a]pyrazolo-[4',3':5,6]pyrido[3,4-e]pyrimidin-5(8H)-one is obtained. This compound is now processed as in Example 1, part c, substituting bromobenzene for the methyl iodide. A small amount of copper catalyst is added to obtain 1-furfuryl-2-methyl-4-phenyl-4H-pyrazolo[1,5-a]pyrazolo[4',3':5,6]pyrido-[3,4-e]pyrimidin-5(8H)-one.

Sources & evidence

ORD record
ord-ff40ce0efa184ce7a2a18d639e54d085
Source dataset
uspto-grants-1978_01
Patent number
US04070466

Linked notes

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