Derivatives of substituted urea, acyl ureas, and sulphonyl ureas, and a process for producing the same

Abstract

Abstract A process for the production of compounds of the general formula: ##STR1## and compounds of that general formula, in which A represents hydrogen or an R 1 -- X group (in which X represents --CO or --SO 2 and R 1 represents an optionally substituted alkyl, cycloalkyl, aralkyl, alkoxy, aryl, aryloxy, etheroxy, aliphatic or aromatic group), R 2 represents a hydrogen atom or an optionally substituted alkyl, cycloalkyl, aralkyl, or aryl group, and R 3 represents a hydrogen atom or an alkyl group derived from a secondary or tertiary alcohol, particularly a tertio-butyl group, with the restriction that, when R 2 represents hydrogen, R 3 represents the said alkyl group and that, when R 3 represents hydrogen, R 2 represents the said optionally substituted alkyl, cycloalkyl, aralkyl, or aryl group, the said process comprising reacting a cyanamide of the formula: ##STR2## (in which A and R 2 have the meanings given above) with a compound e.g. a tertiary or secondary alcohol adapted to form readily a carbo cation (R 3 + ) in the presence of a catalyst e.g. sulphuric acid or a Lewis acid.

Inventors

• 👤 Jesus Anatol
• 👤 Jean Berecoechea

Bibliographic Details