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2005
Pyridine derivatives
R 0380
Imidazolinium Salts as Catalysts for the Aza-Diels—Alder Reaction. — Among
prepared imidazolinium salts varying in the 2-aryl substituent and the
23- 134 several
counter-anion, derivatives FPI and CPI are found to give the best yields of dihydropyridinone (IIIa) from the title reaction of imine (IIa) with Danishefsky's diene (I). Using
FPI as catalyst, the scope of the reaction is explored for various imines. In addition, salt
FPI is tested as a catalyst in the reaction of diene (V) with dienophiles (IV). —
(JURCIK, V.; WILHELM*, R.; Org. Biomol. Chem. 3 (2005) 2, 239-244; Inst. Org.
Chem., TU Clausthal, D-38678 Clausthal-Zellerfeld, Germany; Eng.) — Klein
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