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1. Pyridinium ylides of malonyl heterocycles
Schindler G., Hariri M., Peichel E., Stadlbauer W., Kappe Th.
Austrian- German chemist's meeting, Salzburg (Austria), 27.4.1976; (Österr. Chem. Z. 1976 (4) 2)

Abstract: A number of methods have been developed for the preparation of pyridinium ylides of mesomeric sixmembered heterocycles. According to the formula scheme the quinoline derivative 2 was obtained. Pyridine derivatives such as isoquinoline or nicotineamide give similar ylides. The best yields were obtained from the compounds 4 and 6.

Scheme 1a
Scheme 1a