Organic compounds -- part of the class 532-570 series – Organic compounds – Chalcogen in the nitrogen containing substituent
Patent
1977-12-06
1979-02-20
Raymond, Richard
Organic compounds -- part of the class 532-570 series
Organic compounds
Chalcogen in the nitrogen containing substituent
2602444, 544124, 544359, 546304, 546311, 546348, 546193, 546281, C07D21373, C07D21374
Patent
active
041408535
ABSTRACT:
A process for the preparation of aminopyridines of the formula ##STR1## wherein R.sub.1 and R.sub.2 are identical or different and are hydrogen or lower alkyl or, together with the nitrogen atom to which they are attached, form a 5-, 6-, or 7-membered heterocyclic ring containing up to 2 more hetero atoms, comprises reacting 4-pyridylpyridinium chloride or a salt thereof, at an elevated temperature, with an acid amide of the formula ##STR2## wherein R.sub.1 and R.sub.2 are as above and Z is --CO--R.sub.3 wherein R.sub.3 is hydrogen, lower alkyl, ##STR3## and R.sub.4 and R.sub.5 are hydrogen or lower alkyl.
REFERENCES:
anger et al, Talanta, vol. 10 (1963), pp. 1302 and 1303.
Jerchel et al, Chem. Ber., vol. 91 (1958), pp. 1266 to 1273.
Klingsberg, Pyridine and Its Derivatives, Interscience, New York, Part II (1961) p. 11 and Part III (1962) p. 11.
Raymond Richard
Schering Aktiengesellschaft
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