Process for the preparation of pure, unsymmetrically disubstitut

Details Process for the preparation of pure, unsymmetrically disubstitut Process for the preparation of pure, unsymmetrically disubstitut

1990-10-30

1992-03-24

Gray, Bruce

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546209, 546226, 548163, 548185, 548196, 548212, 548213, 548214, 548217, 548221, 548222, 548225, 548228, 548230, 548233, 548241, 548244, 548245, 548246, 548538, 564 48, 564 52, 564 53, 564 54, C07D40100

Patent

active

050990217

ABSTRACT:
Process for the preparation of pure, unsymmetrically disubstituted ureas of the general formula ##STR1## in which R denotes a phenyl radical which is unsubstituted, or monosubstituted or polysubstituted by halogen atoms or alkyl, alkoxy, aryloxy or trifluoromethyl groups, an oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, benzoxazolyl or benzothiazolyl radical which is unsubstituted, or monosubstituted or polysubstituted by halogen atoms or alkyl, alkoxy or trifluoromethyl groups and R.sub.1 and R.sub.2 independently of one another denote a hydrogen atom or an alkyl group, where R.sub.1 and R.sub.2 are not simultaneously hydrogen or R.sub.1 and R.sub.2 together denote a butylene or pentylene group, by reaction of an N-alkyl- or N,N-dialkylurea with an unsubstituted or substituted arylamine or a heterocyclic amine in the presence of that amine which is already present in the starting material, the respective N-alkyl- or N,N-dialkylurea.

REFERENCES:
patent: 3725428 (1973-04-01), Janiak
patent: 4212981 (1980-07-01), Yukinaga et al.
patent: 4310692 (1982-06-01), Findeisen et al.
patent: 4380641 (1983-04-01), Canada
Chem. Abst., 100:156593q (1984) p. 534.
Chem. Abst., 90:54594y (1979) p. 579.
Chem. Abst., 82: 27104s (1975) p. 163.
Chem. Abst., 80: 108360h (1974) p. 404.
Chem. Abst., 77: 34357b (1972) p. 507.

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