Preparation of N,N'-dialkyl substituted cyclic urea derivatives

Details Preparation of N,N'-dialkyl substituted cyclic urea derivatives Preparation of N,N'-dialkyl substituted cyclic urea derivatives

1988-12-14

1990-01-30

Schwartz, Richard A.

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

Organic compounds

Nitrogen attached directly or indirectly to the purine ring...

548317, C07D23910, C07D23332

Patent

active

048974803

ABSTRACT:
N,N'-dialkyl-substituted cyclic urea derivatives of the general formula I ##STR1## where R.sup.1 and R.sup.2 are each alkyl of 1 to 8 carbon atoms and A is CR.sup.3 R.sup.4 -CR.sup.5 R.sup.6 - or CR.sup.3 R.sup.4 -CR.sup.5 R.sup.6 -CR.sup.7 R.sup.8, where R.sup.3 to R.sup.8 are each hydrogen or alkyl of 1 to 17 carbon atoms, are prepared by reacting a diamine of the formula II ##STR2## with carbon dioxide, by a method in which the reaction is carried out in the gas phase in the presence of an oxide of an element of main group three or four or subgroup two to six of the Periodic Table, or a mixture of these, or in the presence of an aluminum silicate or magnesium silicate.
1,3,4-trimethyl-2-imidazolidinone is used as a polar solvent at low temperatures.

REFERENCES:
patent: 2497308 (1950-02-01), Larson
patent: 4642351 (1987-02-01), Woo et al.
P. Shenoy, et al., Am. Dyestuff Rep., 57, 1968, 352-360.
J. Mulvaney, et al., Ind. Eng. Chem. 40, 1948, 393-397.
R. Nomura et al., Ind. Eng. Chem. Res., 26, 1987, 1056-1059.
Chem. Abstracts 98, 126094a, (1983), (Jpn. Kokai Tokyo Koho JP 57, 175, 170, 10/28/83).

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