Cycloaddition of (N-alkyl-N-phenylamino)ketene with imines
摘要:
(N-Alkyl-N-phenylamino)ketenes were prepared in the presence of various imines, and a [2 + 2] cycloaddition reaction occurred to yield 3-(N-alkyl-N-phenylamino)-2-azetidinones. The size and electronic nature of the imine substituents were varied in order to probe those factors that influence the stereochemistry of the cycloaddition. The stereochemistry of the 2-azetidinone was determined by the substitution pattern of the imines. In general, the stereochemistry of the 2-azetidinone products are significantly influenced by the bulk of the N substituent on the imine. These results are discussed in terms of a two-step zwitterionic intermediate.
Gawinecki, Ryszard, Polish Journal of Chemistry, 1987, vol. 61, # 4-6, p. 589 - 598
作者:Gawinecki, Ryszard
DOI:——
日期:——
Arcoria, Antonino; Cipria, Antonio; Longo, Maria Luisa, Gazzetta Chimica Italiana, 1987, vol. 117, # 12, p. 723 - 730
作者:Arcoria, Antonino、Cipria, Antonio、Longo, Maria Luisa、Maccarone, Emanuele、Tomaselli, Gaetano Andrea
DOI:——
日期:——
Floc'H, Yves Le; Morvan, Jean-Marcel; Brault, Auguste, Bulletin de la Societe Chimique de France, 1980, vol. 2, # 3-4, p. 157 - 162
作者:Floc'H, Yves Le、Morvan, Jean-Marcel、Brault, Auguste
DOI:——
日期:——
Rhodium-Catalyzed Reductive Mannich Coupling of Vinyl Ketones to <i>N</i>-Sulfonylimines Mediated by Hydrogen
作者:Susan A. Garner、Michael J. Krische
DOI:10.1021/jo070779w
日期:2007.7.1
Catalytic hydrogenation of methyl vinyl ketone (MVK) and ethyl vinyl ketone (EVK) in the presence of N-(o-nitrophenylsulfonyl)imines 8a-13a at ambient pressure with tri-2-furylphosphine-ligated rhodium catalysts enables formation of Mannich products 8b-13b and 8c-13c with moderate to good levels of syn-diastereoselectivity. As revealed by an assay of various N-protecting groups, excellent yields of reductive Mannich product also are obtained for N-arylimines 1a-4a, although diminished levels of syn-diastereoselectivity are observed. Coupling of MVK to imine 8a under a deuterium atmosphere provides deuterio-8b, which incorporates a single deuterium atom at the former enone beta-position.
FLOSN U. LE; MORVAN J.-M.; BRAULT A., BULL. SOC. CHIM. FRANCE, 1980, PART 2, NO 3-4, 157-162