ES394314A1 - Procedure for the preparation of 3-halogen-6-hydroxy-pyridines- (2). (Machine-translation by Google Translate, not legally binding)
- Google Patents
Procedure for the preparation of 3-halogen-6-hydroxy-pyridines- (2). (Machine-translation by Google Translate, not legally binding)
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Novartis AG
Original Assignee
Ciba Geigy AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CH1237170Aexternal-prioritypatent/CH563365A5/xx
Application filed by Ciba Geigy AGfiledCriticalCiba Geigy AG
Publication of ES394314A1publicationCriticalpatent/ES394314A1/en
Process for the preparation of 3-halogen-6-hydroxy-pyridones- (2) of the general formula ** (see formula) ** In which R and r'each denote a hydrogen atom, an alkyl or aryl radical or a heterocyclic radical; and more especially those in which they are hydrogen atoms or alkyl radicals with at most 4 carbon atoms, in particular methyl or ethyl radicals; y X means a halogen atom; And especially those that respond to the formula ** (see formula) ** In which R denotes an alkyl or aryl radical; X denotes a halogen atom; y N denotes a positive whole number, preferably from 1 to 4, Characterized by reacting 6-hydroxy-pyridones- (2) unsubstituted at the 3-position, especially those of the formula ** (see formula) ** In which R and r'each denote a hydrogen atom, an alkyl or aryl radical or a heterocyclic radical, With halogenating agents; And advantageously, halogenating 6-hydroxy-pyridones- (2) containing in the 5-position a dissociable substituent, in particular a -cn, -coor or -conh2 group, and, once the halogenation is carried out, dissociating said substituent, particularly by saponification (Machine-translation by Google Translate, not legally binding)
ES394314A1970-08-191971-08-18Procedure for the preparation of 3-halogen-6-hydroxy-pyridines- (2). (Machine-translation by Google Translate, not legally binding)
ExpiredES394314A1
(en)
Procedimine for the obtaining of derivatives of the acid p- [cumarinyl- (3)] - phenyl carbamine (Machine-translation by Google Translate, not legally binding)