Certain indole derivatives useful as leukotriene antagonists

Abstract

A compound of the formula ##STR1## in which R.sup.1 is hydrogen, halo, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, nitrile, optionally protected carboxy, optionally protected tetrazolyl, trihalomethyl, hydroxy-C.sub.1-4 alkyl, aldehydo, --CH.sub.2 Z, --CH.dbd.CH--Z or --CH.sub.2 CH.sub.2 Z where Z is optionally protected carboxy or optionally protected tetrazolyl; R.sup.2 is halo, nitrile, an optionally protected acid group or --CONR.sup.7 R.sup.8 where R.sup.7 and R.sup.8 are each hydrogen or C.sub.1-4 alkyl; R.sup.3 and R.sup.4 are each hydrogen, C.sub.1-4 alkyl, optionally substituted phenyl, or C.sub.1-4 alkyl substituted by --CONR.sup.7 R.sup.8 or an optionally protected acid group; R.sup.5 is ##STR2## where W is --CH.dbd.CH--, --CH.dbd.N--, --N.dbd.CH--, --O-- or --S--, R.sup.9 is hydrogen, halo, C.sub.1-4 alkyl, C.sub.1-4 alkoxy or trihalomethyl, and R.sup.10 is hydrogen, C.sub.1-4 alkyl, C.sub.2-6 alkenyl, C.sub.3-6 cycloalkyl or C.sub.1-4 alkyl-C.sub.3-6 cycloalkyl; R.sup.6 is hydrogen or C.sub.1-4 alkyl; X is --O--(CH.sub.2).sub.n CR.sup.11 R.sup.12, --CR.sup.11 R.sup.12 --, --CR.sup.11 R.sup.12.(CH.sub.2).sub.n.CR.sup.13 R.sup.14 -- or --CR.sup.11 .dbd.CR.sup.12 -- where R.sup.11, R.sup.12, R.sup.13 and R.sup.14 are each hydrogen or C.sub.1-4 alkyl, and n is 0, 1 or 2; and Y is --O--CR.sup.15 R.sup.16 --, --CR.sup.15 .dbd.CR.sup.16 -- or --CR.sup.15 R.sup.16.CR.sup.17 R.sup.18 -- where R.sup.15, R.sup.16, R.sup.17 and R.sup.18 are each hydrogen or C.sub. 1-4 alkyl; or a salt thereof. The compounds in unprotected form are active as leukotriene antagonists.