Patent number: 5811419
Abstract: Compounds of formula I ##STR1## wherein R.sup.1 is hydrogen or an acyl group derived from a carboxylic acid;R.sup.2 is hydrogen, hydroxy, lower alkyl, cycloalkyl, lower alkoxy, lower alkenyl, cycloalkenyl, lower alkynyl, aryl-lower alkyl, aryl, aryloxy, aryl-lower alkoxy or a heterocyclic ring; the lower alkyl, cycloalkyl, lower alkoxy, lower alkenyl, cycloalkenyl, lower alkynyl, aryl-lower alkyl, aryl, aryloxy, aryl-lower alkoxy and the heterocyclic ring being unsubstituted or substituted with at least one group selected from carboxy, amino, nitro, cyano, lower alkyl, lower alkoxy, hydroxy, halogen, --CONR.sup.21 R.sup.22, --N(R.sup.22)COOR.sup.23, R.sup.22 CO--, R.sup.22 OCO-- or R.sup.22 COO--, wherein R.sup.21 is hydrogen, lower alkyl, or cycloalkyl; R.sup.22 is hydrogen or lower alkyl; R.sup.
Type:
Grant
Filed:
December 17, 1996
Date of Patent:
September 22, 1998
Assignee:
Hoffmann-La Roche Inc.
Inventors:
Christian Hubschwerlen, Jean-Luc Specklin