申请人:SMITH KLINE & FRENCH LABORATORIES
LIMITED
公开号:EP0122109A2
公开(公告)日:1984-10-17
The present invention provides a process for preparing compounds of formula (5):
which are useful as intermediates in the preparation of compounds which are histamine Ht-antagonists. In formula (5)
A is a 5-membered heterocyclic aromatic group containing up to three hetero-atoms of which no more than one can be oxygen or sulphur and from one to three can be nitrogen; a 6-membered monocyclic aromatic group optionally containing up to three nitrogen hetero-atoms or a 9- or 10-membered bicyclic aromatic group optionally containing up to four hetero-atoms, of which no more than one can be oxygen or sulphur and from one to four can be nitrogen, the group A being optionally substituted with one or more groups which are inert under the reaction conditions;
X is a C1-5 alkylene group or a C2-5 alkenyle group; which comprises (a) reacting a compound of formula (6):
where A and X are as defined with reference to formula (5) with hydrazine in the presence of a transition metal catalyst to form a compound of formula (7):
where A and X are as defined with reference to formula (5) and thereafter (b) reacting the compound of formula (7) so obtained with more hydrazine and Raney nickel.
本发明提供了一种制备式(5)化合物的工艺:
其可作为制备组胺 Ht 拮抗剂化合物的中间体。在式 (5) 中
A 是一个 5 元杂环芳香基团,最多含有三个杂原子,其中氧或硫原子不能多于一个,氮原子可以是一至三个;一个 6 元单环芳香基团,可选含有最多三个氮杂原子;或一个 9 元或 10 元双环芳香基团,可选含有最多四个杂原子,其中氧或硫原子不能多于一个,氮原子可以是一至四个,基团 A 可选被一个或多个在反应条件下为惰性的基团取代;
X 是 C1-5 烯基或 C2-5 烯基;其中包括 (a) 使式 (6) 的化合物反应:
其中 A 和 X 如参照式(5)所定义,在过渡金属催化剂存在下与肼反应生成式(7)化合物:
其中 A 和 X 如参照式(5)所定义,然后 (b) 将这样得到的式(7)化合物与更多的肼和雷尼镍反应。