Amino acid derivatives.

摘要

Compounds of the formula <CHEM> wherein R<1> represents alkoxycarbonyl, aralkoxycarbonyl, alkanoyl, cycloalkylcarbonyl, aralkanoyl, aroyl, heterocyclylcarbonyl, alkylsulphonyl, arylsulphonyl, monoaralkylcarbamoyl, cinnamoyl or alpha -aralkoxycarbonylaminoalkanoyl and R<2> represents hydrogen or R<1> and R<2> together with the nitrogen atom to which they are attached represent a cyclic imide group of the formula <CHEM> in which P and Q together represent an aromatic system; R<3> represents alkyl, cycloalkyl, aryl, aralkyl, heterocyclylalkyl, cyanoalkyl, alkylsulphinylalkyl, carbamoylalkyl or alkoxycarbonylalkyl or, when n stands for zero, R<3> can also represent alkylthioalkyl or, when n stands for 1, R<3> can also represent alkylsulphonylalkyl; R<4> represents alkyl, cycloalkyl, cycloalkylalkyl, aryl or aralkyl; R<5> represents hydrogen and R<6> represents hydroxy or R<5> and R<6> together represent oxo; R<7> and R<8> together represent a trimethylene or tetramethylene group which is optionally substituted by hydroxy, alkoxycarbonylamino or acylamino or in which one -CH2- group is replaced by -NH-, -N(alkoxycarbonyl)-, -N(acyl)- or -S- or which carries a fused cycloalkane, aromatic or heteroaromatic ring; and R<9> represents alkoxycarbonyl, monoalkylcarbamoyl, monoaralkylcarbamoyl, monoarylcarbamoyl or a group of the formula <CHEM> in which R<1><0> and R<1><1> each represent alkyl; and their pharmaceutically acceptable acid addition salts inhibit proteases of viral origin and can be used as medicaments for the treatment or prophylaxis of viral infections. They can be manufactured according to generally known procedures.