Two-step method for preparing cyclic ureas

Details Two-step method for preparing cyclic ureas Two-step method for preparing cyclic ureas

1992-02-19

1993-04-27

Higel, Floyd D.

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

Organic compounds

Unsubstituted hydrocarbyl chain between the ring and the -c-...

540451, 540464, C07D41312, C07D 1406

Patent

active

052063623

ABSTRACT:
Disclosed is a two-step method for the preparation of cyclic urea products which comprises: heating a diamine with urea in a mole ratio of about 1 at a temperature from about 120.degree. C. to 140.degree. C. until a mole of ammonia is liberated and slowly heating the intermediate with an alcohol or polyether solvent to a temperature from about 160.degree. C. to 200.degree. C. to produce the cyclic urea products.

REFERENCES:
patent: 3763106 (1973-10-01), Markiewitz
patent: 5051503 (1991-09-01), Schlight
L. Birkofer et al., Chem. Ber., 93, 2810 (1960).
A. V. Bogatsky, Synthesis, 1982, 464.
J. Heterocyclic Chem., 10, 6 39 (1973).
N. G. Lukyanenko, Synthesis, 1986, 928.
J. Michels, J. Org. Chem., 25, 2246 (1960).
S. Ozaki et al., J. Am. Chem. Soc., 79, 4358 (1957).

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