Process for making 4-methyl-4,5-dihydrotetrazolo [1,5-a] quinazo

Details Process for making 4-methyl-4,5-dihydrotetrazolo [1,5-a] quinazo Process for making 4-methyl-4,5-dihydrotetrazolo [1,5-a] quinazo

1979-06-19

1980-10-07

Coughlan, Jr., Paul M.

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

544287, C07D45500

Patent

active

042269946

ABSTRACT:
In a process for preparing the compound 4-methyl-4,5-dihydrotetrazolo [1,5-a] quinazolin-5-one having the structural formula: ##STR1## which comprises the steps of (i) bringing anthranilic acid into reaction with cyanamide at a temperature in the range of 80.degree. to 100.degree. C.; (ii) bringing the reaction product obtained by the foregoing step (i) into reaction with hydrazine hydrate in the presence of an organic solvent; then (iii) diazotizing the hydrazino compound so formed to yield a tetrazole; and finally (iv) methylating the tetrazole, the improvement which comprises using n-butanol as the organic solvent in step (ii).

REFERENCES:
patent: 4087422 (1978-05-01), Bowie et al.

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