Heterocycles p. 731 - 744 (1987)
Update date:2022-08-05
Topics:
Heinisch, Gottfried
Loetsch, Gerhard
Homolytic alkoxycarbonylation reactions with cyanopyridines 1a, 2a, 3a, alkyl pyridinecarboxylates 1b, 2b, 3b, 3c and ethyl 4-pyridazinecarboxylate 4 in presence of dichloromethane were studied.It is demonstrated that under these conditions multiple substitution in general is suppressed markedly.Thus, this experimentally simple procedure represents an efficient and versatile method for single-step preparations of alkyl cyanopyridinecarboxylates 7a, 8a, 9a, 10a.Furthermore, it provides convenient access to so far not available mixed esters 5b, 7b, 8b, 10b, 13, derived from 2,3-pyridine-, 2,4-pyridine-, 3,4-pyridine and 4,5-pyridazinedicarboxylic acid.
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