Carbazolone derivatives and process for preparing the same

Details Carbazolone derivatives and process for preparing the same Carbazolone derivatives and process for preparing the same

C - Chemistry, Metallurgy

07

D

C07D 209/88 (2006.01) C07D 403/06 (2006.01) C07D 491/107 (2006.01)

Patent

CA 2106642

The invention relates to carbazolone derivatives of the formula Image wherein A represents a group of formula Image wherein R represents a hydroxyl or 2-methyl-1H- imidazol-1-yl group; B represents a group of formula Image wherein R1 represents hydrogen or a methyl or ethyl group; or A and B together form a group of formula -2- Image wherein R2 means a methyl or ethyl group; or A and B together form a group of formula Image The above compounds are useful intermediates in the: syn- thesis of ondansetron of formula Image chemically 9-methyl-3-[(2-methyl-1H-imidazol-1-yl)methyl]- -1,2,3,9-tetrahydro-4H-carbazol-4-one. The invention further relates to a novel process for the preparation of compounds of the formula (I), wherein A and B are the same as in formula (I) but B may be also hydrogen. Thus, this novel process is suitable for the preparation of ondansetron itself.

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