Preparation of pyrazolo[5,1-b]quinazolones

Details Preparation of pyrazolo[5,1-b]quinazolones Preparation of pyrazolo[5,1-b]quinazolones

1988-09-09

1991-07-02

Rivers, Diana

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

C07D48702

Patent

active

050287052

ABSTRACT:
Pyrazolo[5,1-b]quinazolones are prepared by reacting isatoic anhydrides with pyrazolones at from 100.degree. to 180.degree. C. in an inert organic solvent with simultaneous azeotropic removal of the water formed in the course of the reaction.

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patent: 4303795 (1981-12-01), Conley et al.
patent: 4925946 (1990-05-01), Kanter et al.
Angew. Chem. vol. 74, pp. 839-847 Jahrg. 1962, Nr. 21 Synthesen Und Reaktionen Neuer Ortho . . . Menzel, et al.
Journal of Heterocyclic Chemistry vol. 18, 1981 pp. 117-121 Reactions of 2H-3,1Benzoxazine-2,4-(1H)Dione . . . Sircar, et al.
Journal of Medicinal Chemistry, vol. 24, 1981, pp. 735-742 Pyrazolo[5,1-b]Quinazolin-9-Ones: . . . Sircar, et al.
Spath, et al., Chemische Berichte, vol. 68, pp. 2221-2226 (1935).
Enomoto, et al., Chemical Abstracts, vol. 75; 95588u (1971).

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