Compounds of general formula (I)
and physiologically acceptable salts and hydrates thereof in which
R1 and R2 each represent methyl groups or together with the nitrogen atom to which they are attached form a pyrrolidino, piperidino or hexamethylenimino group;
R3 represents hydrogen or methyl;
Alk represents a straight or branched alkylene chain of 1 to 6 carbon atoms;
R4 represents a hydrogen atom and R5 represents a C1-4 alkyl group; or R4 and R5 together with the atoms to which they are attached form a tetrahydropyranyl ring; and
either n is zero, X is oxygen, m is 3 or 4, and Q is a benzene ring linked through the 1- and 3- positions;
or n is 1, X is sulphur, m is 2, and Q is a furan ring linked through the 2- and 5- positions with optionally a methyl substituent on the carbon atom adjacent to the group R1R2NCH2, or Q is a thiophene ring linked through the 2-and 4- positions with the group R1R2NCH2 in the 2- position;
with the proviso that when Q is other than a benzene ring, R1 and R2 are methyl groups,
are disclosed as having action as histamine H2- antagonists.
                            通式(I)化合物
及其生理上可接受的盐类和
水合物,其中
R1 和 R2 各自代表甲基,或与它们所连接的氮原子一起形成
吡咯烷基、
哌啶基或六亚甲基;
R3 代表氢或甲基;
Alk 代表 1 至 6 个碳原子的直链或支链亚烷基;
R4 代表氢原子,R5 代表 C1-4 烷基;或者 R4 和 R5 与它们所连接的原子一起形成一个
四氢吡喃基环;以及
或者 n 为零,X 为氧,m 为 3 或 4,Q 为通过 1 和 3-位连接的苯环;
或 n 为 1,X 为
硫,m 为 2,Q 为通过 2-位和 5-位连接的
呋喃环,在与基团 R1R2NCH2 相邻的碳原子上可选择具有甲基取代基;或 Q 为通过 2-位和 4-位连接的
噻吩环,在 2-位具有基团 R1R2NCH2;
但当 Q 不是苯环时,R1 和 R2 为甲基、
这些化合物具有
组胺 H2- 拮抗剂的作用。