| 摘要 |
<p>Compounds of the formula (I) :-
<CHEM>
(I)
and their salts are histamine H2-antagonists, wherein: R<o> is 2-guanidinothiazol-4-yl or a group R<1>R<2>N(CHn-Z- wherein R<1> and R<2> are independently hydrogen, C1-6alkyl, phenyl(C1-6)alkyl, furanyl(C1-6)alkyl, thienyl(C1-6)alkyl, C3-10 cycloalkyl, hydroxy(C2-6)alkyl, or halo(C2-6)alkyl (wherein said hydroxy and halo groups are not substituted on the carbon atom adjacent to the nitrogen atom); or R<1> and R<2> together represent - (CH2)r - wherein r is 4 to 7, to form together with the nitrogen atom to which they are attached a 5-8 membered saturated ring; n is an integer from 1 to 6; Z is 2,5-furanyl, 2,5-thienyl, 2,4-pyridyl wherein the R<1>R<2>N(CH2)n group is in the 4-position, 2,4-thiazolyl wherein the R<1>R<2>N(CH2)n group is in the 2-position, or 1,3- or 1,4-phenylene; m is one; or if Z is pyridyl or phenylene m may also be zero; Y is oxygen, sulphur or methylene; or if Z is furanyl, thienyl or thiazolyl Y may also be a bond; p is two, three or four; q is zero or one; R<3> is hydrogen or C1-6alkyl; and R<4> is hydrogen, optionally substituted C1-6alkyl, C3-10- cycloalkyl, C3-10cycloalkyl(C1-6)alkyl, C2-6alkenyl or C2-6alkynyl,and when q is zero R<4> may also be -(CH2)sB wherein s is 1 to 6 and B is optionally substituted aryl or heteroaryl.
<??>Pharmaceutical compositions containing them are described as are processes for their preparation. </p> |
