Studies on Uricosuric Diuretics. II. Substituted 7,8-Dihydrofuro(2,3-g)-1,2-benzisoxazole-7-carboxylic acids and 7,8-Dihydrofuro(2,3-g)benzoxazole-7-carboxylic acids.
Studies on Uricosuric Diuretics. II. Substituted 7,8-Dihydrofuro(2,3-g)-1,2-benzisoxazole-7-carboxylic acids and 7,8-Dihydrofuro(2,3-g)benzoxazole-7-carboxylic acids.
Novel furobenzisoxazole derivatives of the formula (I): ##STR1## (wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 which may be the same or different represent a hydrogen atom, a halogen atom, or a lower alkyl group having 1-4 carbon atoms; R.sub.5 is a hydroxymethyl group, a carboxyl group or a lower alkoxy carbonyl group having 1-3 carbon atoms; and X is a sulfur atom or a --CH.dbd.CH-- group), as well as intoxic salts thereof when R.sub.5 is a carboxyl group, and process for preparing the same are disclosed. The derivatives of formula (I) and nontoxic salts thereof have hypotensive, uricosuric and diuretic activities and hence ae useful as therapeutics for treating hyperuricemia, edema and hypertension.
Studies on Uricosuric Diuretics. II. Substituted 7,8-Dihydrofuro(2,3-g)-1,2-benzisoxazole-7-carboxylic acids and 7,8-Dihydrofuro(2,3-g)benzoxazole-7-carboxylic acids.
作者:Haruhiko SATO、Takashi DAN、Etsuro ONUMA、Haruko TANAKA、Bunya AOKI、Hiroshi KOGA
DOI:10.1248/cpb.39.1760
日期:——
A series of substituted 7, 8-dihydrofuro[2, 3-g]-1, 2-benzisoxazole-7-carboxylic acids 9 and 7, 8-dihydrofuro[2, 3-g]benzoxazole-7-carboxylic acids 12 were synthesized and evaluated for uricosuric and diuretic activities in rats. Many of the benzisoxazole derivatives 9 showed uricosuric and only weak diuretic activities, whereas the benzoxazoles 12 exhibited potent diuretic activities with little affecting urate excretion. Among these compounds, 5-chloro-7, 8-dihydro-3-phenylfuro[2, 3-g]-1, 2-benzisoxazole 7-carboxylic acid (9b, AA-193) was found to be a potent uricosuric agent without diuretic activity and was selected for further development.