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3-Formyl-2-methoxycarbonylpyridine and isopropyl 3formylpyridine-2-carboxylate have each been efficiently accessed in one step via the ozonolyses of 8-methoxyor of 8-isopropoxyquinoline under near-ambient conditions. The compou nds can be utilized as intermediates for syntheses of the tricyclic ketone 8-chloro-6,11-dih y ro-5H-benzo[5,6]cyclohepta[1,2b]pyridin11-one, a precursor to the important non-sedating a ntihistamine Claritin.

Ozonolysis of some 8-alkoxyquinolines, and synthesis of a precursor to the non-sedating antihistamine Claritin