Bisaryl‐8H‐imidazo[2,1‐c][1,4]thiazines were prepared from the corresponding 2‐thiomethylimidazoles. A novel and efficient synthesis is presented for these intermediates based on the condensation of benzils with protected 2‐thioacetaldehydes.
Aus 4‐Methoxy‐benzylmercaptan (I) erhält man mit Bromacetaldehydacetal (II) den Aldehyd (III), der in Gegenwart von Ammoniumacetat (V) mit den Diketonen (IV) zu den geschützten Thiomethyl‐imidazolen (VI) führt.
Das Piperidin (I) wird mit den Aldehyden (II) zu den Verbindungen (III) kondensiert, die nach Hydrierungzu (IV) zu (i)‐Methyldecamin (Va) und zur Verbindung (Vb) cyclisiert werden.
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