| 摘要 |
<p>Antihypertensive and bronchodilating compounds of formula (I) or a pharmaceutically acceptable salt thereof, and a process for preparing them are disclosed, wherein: R1, R2 and R3 are hydrogen, lower alkyl, lower alkoxy, halogeno, hydroxy, (di-lower alkyl)amino, 4-morpholinyl, 1-pyrrolidinyl, 1-pyrrolyl, -CF3, -OCF3, phenyl or methoxyphenyl; or R1 and R2 together are methylenedioxy; or R1 and R2 together with the carbon atoms to which they are attached form a benzene ring; and Ra is hydrogen and R?b and Rc¿, together with the carbon atoms to which they are attached, form a saturated ring of 5 carbons; or Ra is lower alkyl, Rb is hydrogen or lower alkyl, and Rc is hydrogen; or Ra, Rb and the carbon atom to which they are attached form a saturated ring of 5-7 carbons, and Rc is hydrogen; or Ra is hydrogen, and Rb, Rc and the carbon atoms to which they are attached form a tetrahydrofuran ring; or R?a and Rb¿, together with the carbon atom to which they are attached, and R?b and Rc¿, together with the carbon atoms to which they are attached, each form a saturated ring of 5-7 carbons; pharmaceutical compositions containing said compounds: methods of treatment using said compounds; and a process for preparing polycyclic guanines comprising a) reducing a nitrosopyrimidine, and treating the reduced nitrosopyrimidine with an acylating reagent to give the amidopyrimidine; b) reacting the amidopyrimidine with a halogenating/cyclizing reagent to give a halopurine; c) reacting, in the presence of a base, the halopurine with an amine to give the substituted aminopurine; and d) closing the ring of the substituted aminopurine with a suitable dehydrating agent.</p> |
