The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 14, 1978
Filed:
Apr. 12, 1977
Marcel E Pesson, Paris, FR;
Suzanne W Geiger, Montmorency, FR;
Laboratoire Roger Bellon, , FR;
Abstract
Process for the preparation of a 4-chloro-5-alkoxycarbonyl-2-methoxy-pyrimidine of the formula: ##STR1## IN WHICH R.sub.1 is a lower alkyl radical with 1 to 4 carbon atoms, which comprises the following stages: A) condensation of a salt of O-methylisourea and an inorganic or organic acid, with an alkyl alkoxymethylenemalonate ##STR2## in an aqueous medium and in the presence of an excess of an alkali metal hydroxide, to form the corresponding salt of the 5-alkoxycarbonyl-4-hydroxy-2-methoxy-pyrimidine, and neutralization of the said salt by the addition of an inorganic or organic acid, in order to liberate this 5-alkoxycarbonyl-4-hydroxy-2-methoxy-pyrimidine, and ##STR3## B) bringing the latter compound, suspended in dimethylformamide, into contact with thionyl chloride, at room temperature, in order to form the corresponding 4-chloro-5-alkoxycarbonyl-2-methoxy-pyrimidine: ##STR4##