Asymmetric synthesis of 4H-1,3-oxazines: enantioselective reductive cyclization of N-acylated β-amino enones with trichlorosilane catalyzed by chiral Lewis bases
作者:Masaharu Sugiura、Mako Kumahara、Makoto Nakajima
DOI:10.1039/b905102c
日期:——
N-Acylated beta-amino enones reductivelycyclize by treatment with trichlorosilane and a chiral Lewis base catalyst to afford optically active 4H-1,3-oxazines, which can be transformed to other chiral compounds without racemization.
An iodine-mediated oxidative dehydrogenation of β-acylamino ketones has been developed for the synthesis of β-ketoenamides in moderate to good yields. Only Z-isomers are accessed due to the intramolecular H-bonding interaction in the HI-elimination step.
已开发出一种碘介导的 β-酰氨基酮氧化脱氢,用于以中等至良好的产率合成 β-酮烯酰胺。由于 HI 消除步骤中的分子内 H 键相互作用,只能访问 Z 异构体。
Cherton, Jean-Claude; Bazinet, Marc; Bolze, Marie-Madeleine, Canadian Journal of Chemistry, 1985, vol. 63, p. 2601 - 2607