In connection with our previous study on the β-adrenoceptor activities of the positional isomers of trimetoquinol, various 1-arylmethyl-1, 2, 3, 4-tetrahydroisoquinolines (10b-i) were synthesized. The Barbier reaction of the quaternary salt (7) with arylmethyl halides, followed by sodium monoacetoxyborohydride [NaBH3 (OAc)] reduction in a one-pot procedure, gave the tribenzyltetrahydroisoquinolines (9b-i) in excellent yields. Catalytic debenzylation of 9b-i furnished 10b-i. None of the compounds (10b-i) exhibited significant bronchodilating activity.
5,7 Dihydroxy-1-(trimethoxybenzyl)-1,2,3,H-tetrahydroisoquinolines and
申请人:Tanabe Seiyaku Co., Ltd.
公开号:US04054659A1
公开(公告)日:1977-10-18
A novel 5,7-dihydroxytetrahydroisoquinoline derivative having the formula: ##STR1## wherein R is trimethoxyphenyl, is prepared either by hydrolysis of a compound having the formula: ##STR2## wherein R.sup.1 is an organic acyl group and R is same as above, or by catalytic hydrogenation of a compound having the formula: ##STR3## wherein R.sup.3 is hydrogen or benzyl and R is same as above. The 5,7-dihydroxytetrahydroisoquinoline derivative (I) or a pharmaceutically acceptable acid addition salt thereof is useful as a bronchodilator.