Derivatives of substituted urea, acyl ureas, and sulphonyl ureas

Details Derivatives of substituted urea, acyl ureas, and sulphonyl ureas Derivatives of substituted urea, acyl ureas, and sulphonyl ureas

1974-11-13

1977-03-22

Raymond, Richard L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260456A, 260468E, 260479C, 260482C, 260551C, 260553R, 260553A, 260553D, 260553E, 260556R, 260556A, 260556AR, 260557R, 260558R, 260561R, 260562R, C07C12506

Patent

active

040137066

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.sub.1 -- X group (in which X represents --CO or --SO.sub.2 and R.sub.1 represents an optionally substituted alkyl, cycloalkyl, aralkyl, alkoxy, aryl, aryloxy, etheroxy, aliphatic or aromatic group), R.sub.2 represents a hydrogen atom or an optionally substituted alkyl, cycloalkyl, aralkyl, or aryl group, and R.sub.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.sub.2 represents hydrogen, R.sub.3 represents the said alkyl group and that, when R.sub.3 represents hydrogen, R.sub.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.sub.2 have the meanings given above) with a compound e.g. a tertiary or secondary alcohol adapted to form readily a carbo cation (R.sub.3 .sup.+) in the presence of a catalyst e.g. sulphuric acid or a Lewis acid.

REFERENCES:
patent: 3332994 (1967-07-01), Marsh
patent: 3427323 (1969-02-01), Marsh
patent: 3748356 (1973-07-01), Wellinga et al.
Karrer, Organic Chemistry, Elsevier Publishing Company, Inc., New York (1950) pp. 231 to 233.

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