Addition reactions of (phenylsulfonyl) propadiene with 1-pyrrolidinyl enamines of cyclic ketones: syntheses and reactions of 1, 3-dienes possessing an allyl sulfone …

…, M Takewaki, I Fujimoto, K Kanematsu

Index: Hayakawa, Kenji; Takewaki, Makoto; Fujimoto, Ichiro; Kanematsu, Ken Journal of Organic Chemistry, 1986 , vol. 51, # 26 p. 5100 - 5105

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Citation Number: 20

Abstract

Addition reactions of (phenylsulfony1) propadiene (1) with various 1-pyrrolidinyl enamines have been investigated. Allene 1 and enamines of cyclic ketones (2, 7-14) readily underwent the Michael-type addition reactions at-50" C to give the adducts 3, 15-20, and/or their isomers 4 and 21-26, which apparently arose by base-catalyzed isomerization of the former. These adducts were conveniently converted into the corresponding 1, 3-dienes ...