Tetrahydropyridinediols and related aldehydes from the reactions of pyridine N‐oxide with mercaptans

Abstract
A new series of tetrahydropyridines was isolated when 1‐adamantyl or t‐butyl mercaptan was added last to a solution of pyridine N‐oxide and triethylamine in acetic anhydride. Under these conditions, the predominant tetrahydropyridines proved to be 1‐acetyl‐2‐alkylthio‐3‐acetoxy‐6‐hydroxy‐1,2,3,6‐tetrahydropyridines. These carbinolamides were isomerized in part during silica gel column chromatography to trans‐4‐acetoxy‐5‐alkylthio‐5‐acetamido‐2‐pentenals.

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