Method for preparing 4-hydroxycinnolines in a pH controlled syst

Details Method for preparing 4-hydroxycinnolines in a pH controlled syst Method for preparing 4-hydroxycinnolines in a pH controlled syst

1985-05-28

1986-10-28

Daus, Donald G.

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

C07D23728

Patent

active

046200002

ABSTRACT:
In the preparation of a 4-hydroxycinnoline wherein the diazonium salt of a 2-aminoacetophenone in aqueous solution is allowed to undergo cyclocondensation, the improvement that comprises maintaining the pH of the solution between about 4.0 and 8.5 during the cyclocondensation.

REFERENCES:
Bersche and Herbert, Annalen der Chemie, vol. 546, pp. 293-303, (1944).
Leonard and Boyd, J. Org. Chem., vol. 11, pp. 419-428, (1946).
Schofield and Simpson, J. Chem. Soc. (London), pp. 512-524, (1945).
Leonard, Chem. Rev., vol. 37, pp. 269-286, (1945).

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