Heterocycles p. 385 - 395 (1996)
Update date:2022-07-29
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Tokuda, Masao
Fujita, Hirotake
Nitta, Makoto
Suginome, Hiroshi
Treatment of 4- and 5-alkynylamines with 0.5-1.2 equiv. of butyllithium brought about a facile anionic cyclization, giving the corresponding enamine pyrrolidines and piperidines having an exo double bond in high yields. Treatment of 4-alkynamides with lit
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