描述了可见光促进的烯烃的非对映异构分子内氧胺化反应,可通过温和地从官能化的羟胺生成伯酰胺基来构建恶唑啉酮,吡咯烷酮和咪唑烷酮。观察到一种独特的现象,即由电子牺牲控制的氮丙啶的高度非对映选择性开环。通过该方案,以克为单位有效地获得了高度非对映选择性的氨基醇衍生物。机理研究表明,可分离的抗氮丙啶中间体是由伯酰胺基快速生成的,非对映选择性是由电子牺牲的p K a值控制的。
描述了可见光促进的烯烃的非对映异构分子内氧胺化反应,可通过温和地从官能化的羟胺生成伯酰胺基来构建恶唑啉酮,吡咯烷酮和咪唑烷酮。观察到一种独特的现象,即由电子牺牲控制的氮丙啶的高度非对映选择性开环。通过该方案,以克为单位有效地获得了高度非对映选择性的氨基醇衍生物。机理研究表明,可分离的抗氮丙啶中间体是由伯酰胺基快速生成的,非对映选择性是由电子牺牲的p K a值控制的。
(dr up to >20:1). This new transformation applies a functionalized hydroxylamine and Et3N·3HF as the nitrogen and fluorine source, which facilitates the efficient synthesis of β-fluoro primaryamines and amino acidsfromallylicalcohol derivatives. Preliminary mechanistic studies reveal that an iron–nitrenoid is a possible intermediate and that its reactivity and enantioselectivity can be efficiently
A diastereoselective aminohydroxylation of olefins with a functionalized hydroxylamine is catalyzed by new iron(II) complexes. This efficient intramolecular process readily affords synthetically useful amino alcohols with excellent selectivity (dr up to > 20:1). Asymmetric catalysis with chiral iron(II) complexes and preliminary mechanistic studies reveal an iron nitrenoid is a possible intermediate that can undergo either aminohydroxylation or aziridination, and the selectivity can be controlled by careful selection of counteranion/ligand combinations.