The invention relates to carbazolone derivatives of the formula
wherein
A stands for a group of formula
wherein R means a hydroxyl or 2-methyl-1 H-imidazol-1-yl group;
B represents a group of formula
wherein R1 means hydrogen or a methyl or ethyl group; or A and B together form a group of formula
wherein R2 means a methyl or ethyl group; or
A and B together form a group of formula
The above compounds are useful intermediates in the synthesis of ondansetron of formula
chemically 9-methyl-3-[(2-methyl-1 H-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).
本发明涉及式如下的
咔唑酮衍
生物
式中
A 代表式中的基团
其中 R 代表羟基或 2-甲基-1-H-
咪唑-1-基团;
B 代表式中的一个基团
其中 R1 指氢或甲基或乙基;或 A 和 B 共同组成一个式组
其中 R2 指甲基或乙基;或
A 和 B 共同形成一个式基团
上述化合物是合成式
昂丹司琼的有用中间体
chemically 9-methyl-3-[(2-methyl-1 H-imidazol-1-yl)methyl]-1,2,3,9-tetrahydro-4H-carbazol-4-one.
本发明进一步涉及一种制备式(I)化合物的新工艺,其中A和B与式(I)中的相同。