Abstract
Abstract 2-Aryl-2,3-dihydrothieno[2,3-b]pyridines have been prepared via intramolecular Diels-Alder reactions of suitably 3-substituted 1,2,4-triazine intermediates, followed by their reductive desulfurization with Raney Nickel to form 3-substituted pyridines. A one-pot synthesis of 2-aryl-2,3-dihydrothieno[2,3-b]-pyridines from thiosemicarbazide is described as well.
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