2,5-Diamino-1,3,4-thiadiazole derivatives

摘要

1,3,4-Thiazole derivatives of the formula ##STR1## wherein R. sub.26 ' denotes a C.sub.1 -C.sub.8 -alkyl radical which is optionally substituted by hydroxyl, halogen, cyano, C.sub.1 -C.sub.4 -alkoxy, carboxyl, aminocarbonyl or C.sub.1 -C.sub.4 -alkoxycarbonyl, a C.sub.2 -C. sub.4 - alkenyl radical, a cyclohexyl radical which is optionally substituted by C.sub.1 -C.sub.4 -alkyl, a phenyl, benzyl or phenylethyl radical which is optionally substituted by halogen, C.sub.1 -C.sub.4 - alkyl or C.sub.1 -C. sub.4 -alkoxy, a C.sub.1 -C.sub.2 -alkylcarbonyl, C. sub.1 -C.sub.4 - alkoxycarbonyl, mono- or di-C.sub.1 -C.sub.4 - alkylaminocarbonyl, aminocarbonyl, mono- or di-C.sub.1 -C.sub.4 - alkylaminosulphonyl, 2- thienyl, 2-furyl, 2-tetrahydrofuryl, amino, C.sub. 1 -C.sub.4 -alkylamino or di-(C.sub.1 -C.sub.4 -alkyl)-amino radical or a phenylamino or benzylamino radical which is optionally substituted by C. sub.1 -C.sub.4 - alkyl or C.sub.1 -C.sub.4 -alkoxy and R.sub.27 ' denotes a C.sub.1 -C.sub. 8 -alkyl radical which is optionally substituted by hydroxyl, halogen, cyano, C.sub.1 -C.sub.4 -alkoxy, carboxyl, aminocarbonyl- or C.sub.1 -C. sub.4 -alkoxycarbonyl, a C.sub.2 -C.sub. 4 - alkenyl radical or a benzyl or phenylethyl radical which is substituted by halogen, C.sub.1 -C.sub.4 - alkyl or C.sub.1 -C.sub.4 -alkoxy,P Pare useful as intermediates for the preparation of pharmaceuticals, agents for protecting plants and dyestuffs.