Process for preparing alkoxyalkylidenehydrazinopyridazine...

Details Process for preparing alkoxyalkylidenehydrazinopyridazine... Process for preparing alkoxyalkylidenehydrazinopyridazine...

C - Chemistry, Metallurgy

07

D

260/170, 260/264

C07D 237/22 (2006.01) C07D 405/12 (2006.01)

Patent

CA 1297474

A B S T R A C T PROCESS FOR PREPARING ALKOXYALKYLIDENEHYDRAZINOPYRIDAZINE DERIVATIVES A process for preparing a compound of the formula (4) : Image (4) is described wherein R3 and R4 are both hydrogen or together are =CR1R2, where R1 is hydrogen or C1-3alkyl and R2 is C1-3alkyl, carboxy or phenyl. which comprises reducing a compound of the formula (5) : Image (5) wherein X is WN or O wherein W is 3,4-di(MeO)Ph(CH2)2- ; Y and Z are both hydrogen or together are a protecting group and thereafter : i) removing the triphenylmethyl group and any other protecting groups: ii) when X is WN optionally reacting with R1R2CO or when X is O reacting with R1R2CO and converting the product so formed to an epoxide of the formula (9) : Image (9) which is reacted with 3,4-dimethoxyphenethylamine, and thereafter optionally removing the CR1R2 group by hydrolysis.

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