5- or 6-substituted beta -carboline-3-carboxylic acid esters

摘要

5- or 6-substituted beta -carboline-3-carboxylic acid esters of Formula I <IMAGE> wherein R1 is hydrogen, nitrilo, halogen, lower alkyl or lower alkoxy, and R3 is a branched C3-6 alkyl group which is optionally substituted by halogen, or a C3-6 cycloalkyl group which is optionally methyl-substituted, are valuable pharmaceuticals.