2001 pyridine derivatives

pyridine derivativesR 0380

42 - 161Aza-Diels–Alder Reactions of 2-(Phenylthio)-1,3-butadiene withSimple Iminium Salts. — The title compound (II) is readily preparedby thermal desulfonation of (I) in the presence of hydroquinone to prevent freeradical-initiated polymerization of (II). The aza-Diels–Alder reactions of (II)with iminium salts, prepared in situ from amine hydrochlorides (III) and alde-hydes (IV), give cyclized products (V) with complete control of regiochemistry.— (CHOU, SHANG-SHING P.; HUNG, CHIA-CHENG; Synth. Commun. 31(2001) 7, 1097-1104; Dep. Chem., Fu Jen Cathol. Univ., Taipei 24205, Taiwan;EN)

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