Dipeptides containing C-terminal phosphinothricin, a process for their preparation and their use for controlling undesirable plant growth
AssigneeHoechst Aktiengesellschaft
InventorsHeinz Kehne, Klaus Bauer, Hermann Bieringer
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Abstract
Dipeptides containing C-terminal phosphinothricin of the formula ##STR1## in which phosphinothricin is attached to a--preferably natural--amino acids at the amino group are effective herbicides in the pre-emergence and post-emergence techniques. The compounds are obtained, for example, by reacting phosphinothricin with the hydroxysuccinimide ester of an amino acids which is protected at the amino group in the presence of a base and subsequently splitting off the protective groups.
Claims4
A compound of the formula I ##STR7## in which R.sup.1 and R.sup.2 independently of one another denote hydrogen, (C.sub.1 -C.sub.12)-alkyl, (C.sub.3 -C.sub.8)-cycloalkyl, phenyl, benzyl or phenethyl, it being possible for the groups mentioned to be substituted in turn by halogen, NH.sub.2, OH, SH, NO.sub.2, (C.sub.1 -C.sub.4)-alkoxy, (C.sub.1 -C.sub.4)-alkylthio, CF.sub.3, (C.sub.1 -C.sub.4)-alkoxycarbonyl, COOH or CONH.sub.2, or
- R.sup.1 and R.sup.2 together denote an alkylene chain of 2-7 carbon atoms,
- R.sup.3 denotes hydrogen or (C.sub.1 -C.sub.12)-alkyl and
- m denotes 0, 1, 2 or 3,
- and the salts thereof with bases and acids.
A compound of the formula I in which
- R.sup.1 and R.sup.2 independently of one another denote hydrogen, (C.sub.1 -C.sub.8)-alkyl, phenyl, benzyl and phenylethyl, it being possible for the groups mentioned to be substituted in turn by NH.sub.2, OH, SH, (C.sub.1 -C.sub.4)-alkoxy, (C.sub.1 -C.sub.4)-alkylthio, (C.sub.1 -C.sub.4)-alkoxycarbonyl, COOH or CONH.sub.2, or
- R.sup.1 and R.sup.2, together with the carbon atom linking them, denote a cyclopentyl or cyclohexyl radical,
- R.sup.3, denotes hydrogen or methyl and m denotes 0, 1 or 2, and the salts thereof.
Dependencies are inferred from the claim text.