合成了空气/水分稳定,晶体和可储存的手性水杨基恶唑啉基氧化(V)配合物,并公开了其在氢化硅烷作为氢化物源的情况下催化不对称还原酮亚胺的催化应用。获得了广泛的底物范围,高收率和出色的对映选择性(最高99%)。此外,对映体纯α-氨基酯,γ-和δ-内酰胺以及异吲哚啉酮的合成也已使用该方法进行。最后,该方法已应用于具有药物相关性的合成靶标,例如R -(+)-沙丁胺碱和R -(+)-crispine A.
Synthesis of 5-Vinyl-2-isoxazolines by Palladium-Catalyzed Intramolecular <i>O</i>-Allylation of Ketoximes
作者:Rodney A. Fernandes、Ashvin J. Gangani、Arpita Panja
DOI:10.1021/acs.orglett.1c01897
日期:2021.8.20
An efficient method for the synthesis of 5-vinyl-2-isoxazolines by Pd-catalyzed intramolecular O-allylation of ketoximes has been developed. The reaction involves Pd(0)-catalyzed π-allyl formation via leaving group ionization or Pd(II)-catalyzed allylic C–H activation followed by intramolecular nucleophilic oxime oxygen attack. This methodology has been elaborated to various value-added products by
The ruthenium-catalyzed C–H functionalization of enamides with isocyanates: easy entry to pyrimidin-4-ones
作者:Pengfei Shi、Song Li、Lu-Min Hu、Cong Wang、Teck-Peng Loh、Xu-Hong Hu
DOI:10.1039/c9cc03612a
日期:——
Ruthenium-catalyzedheteroannulation between enamides and isocyanates has been realized as a complementary approach to conventional strategies for the synthesis of pyrimidin-4-ones. High step- and atom-economy was achieved for the rapid construction of such privileged scaffolds, which are found in a multitude of pharmaceutical compounds. The generality and practicability of this transformation were
Small-Ring Compounds. XXXV. Studies of Rearrangements in the Nitrous Acid Deaminations of Methyl-substituted Cyclobutyl-, Cyclopropylcarbinyl- and Allylcarbinylamines<sup>1a,b</sup>
作者:Marc S. Silver、Marjorie C. Caserio、Howard E. Rice、John D. Roberts
DOI:10.1021/ja01478a028
日期:1961.9
compositions of the alcohol mixtures formed in nitrousaciddeaminations of cyclopropylmethylcarbinylamine, (2-methylcyclopropyl)-carbinylamine, 2-methylcyclobutylamine, 3-methylcyclobutylamine, crotylcarbinylamine and allylmethylcarbinylamine have been determined. These results and the behavior of the corresponding alcohols under isomerization conditions in strongly acidic media may be explained by assuming formation
The synthesis of R-(+) and S-(-) isomers of O-[3-tert-butylamino)-2-hydroxypropyl] cyclopropyl methyl ketone oxime (falintolol) is described. The syn and anti isomers of falintolol were obtained in two different ways from cyclopropyl methyl ketoxime or from falintolol. For comparison purposes, the enantiomers of the dicyclopropyl ketone oxime derivatives were also prepared. Structure-activity relationships