The regioselective aminohydroxylation of allylic carbamates
作者:Timothy J. Donohoe、Peter D. Johnson、Madeleine Helliwell、Martine Keenan
DOI:10.1039/b107253f
日期:2001.10.11
The synthesis and aminohydroxylation of a series of acyclic
allylic carbamates is described: the formation of a putative
OOsNR linkage between the transition metal and substrate is
proposed to account for the high levels of regioselectivity that were
observed; proof of the structure of one of the aminohydroxylation products
was obtained through X-ray crystallography.
介绍了一系列无环烯丙基氨基甲酸酯的合成和氨基羟基化过程:过渡金属和底物之间形成了一种假定的 OOsNR 连接,这就是所观察到的高水平区域选择性的原因;通过 X 射线晶体学,证明了其中一种氨基羟基化产物的结构。
N-benzoylcarbamate cyclizations
作者:Spencer Knapp、Paivi J. Kukkola、Shashi Sharma、Sherrie Pietranico
DOI:10.1016/s0040-4039(00)96738-8
日期:1987.1
Iron(II)-Catalyzed Intramolecular Aminohydroxylation of Olefins with Functionalized Hydroxylamines
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.
Diastereoselective synthesis of substituted 2-amino-1,3-propanediols from Morita-Baylis-Hillman adducts
作者:Paulo H. S. Paioti、Patrícia Rezende、Fernando Coelho
DOI:10.1590/s0103-50532012000200014
日期:——
We report herein a new diastereoselective approach to substituted 2-amino-1,3-propanediols with anti relative stereochemistry from Morita-Baylis-Hillman (MBH) adducts. These structural moieties have been used as intermediates for the synthesis of several compounds with relevant pharmacological and commercial interest. In this strategy, substituted anti 2-amino-1,3-propanediols were readily prepared via ozonolysis of allylic diols obtained from MBH adducts, followed by a diastereoselective reductive amination of the substituted 2-oxo-1,3-propanediols. To demonstrate the synthetic utility of these aminodiols, they were transformed into substituted oxazolidin-2-ones, which were also used in the indirect determination of the relative stereochemistry of the aminodiols.
Amino alcohol and amino sugar synthesis by benzoylcarbamate cyclization
作者:Spencer Knapp、Paivi J. Kukkola、Shashi Sharma、T. G. Murali Dhar、Andrew B. J. Naughton