Chloropyridinium chlorides and process for their preparation

Details Chloropyridinium chlorides and process for their preparation Chloropyridinium chlorides and process for their preparation

1995-01-04

1996-07-30

Ivy, C. Warren

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D21361

Patent

active

055413323

ABSTRACT:
A process for the preparation of a chloropyridine of the formula ##STR1## which comprises reacting an enamide of the formula ##STR2## with a chlorinating agent in the presence of a di-substituted formamide ##STR3## in which R.sup.4 and R.sup.5 each individually is alkyl or cycloalkyl or together are alkanediyl, at a temperature between about -30.degree. C. and 100.degree. C., thereby to produce a compound of the formula ##STR4## and subjecting said compound to thermal cleavage. Compounds I are novel. Compounds IV are known intermediates for agrochemicals and pharmaceuticals.

REFERENCES:
Chem. Ber. 103 3427-3436 (1970), Rembges.
J. Heterocycle. Chem. vol. 28, pp. 1093-1089 (1991), Park.
J. Chem. Soc. Perkin Trans. I, pp. 1173-1182 (1984), Meth-Cohn.
J. Med. Chem. vol. 33, pp. 1667-1675 (1990), Anderson.
J. Org. Chem., vol. 24, pp. 756-760 (1959).
Schneider, Chemical Abstracts 109:6320, 1988.
Lejeune, Chemical Abstrats 93:95099, 1980.
Lejeune, Chemical Abstracts 93:7972, 1980.

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