Catalyst-Free Intramolecular Formal Carbon Insertion into σ-CC Bonds: A New Approach toward Phenanthrols and Naphthols
作者:Ying Xia、Peiyuan Qu、Zhenxing Liu、Rui Ge、Qing Xiao、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201209269
日期:2013.2.25
of carbonyl groups in keto aldehyde substrates has been exploited for the synthesis of phenanthrols, naphthols, and their heteroatom‐containing analogues. Key to this highly efficient and robust methodology is the catalyst‐free intramolecularformal diazo carboninsertion of N‐tosylhydrazones into keto CCbonds (see scheme).
The use of a chiral (NCP)Ir complex as the precatalyst allowed for the discovery of asymmetrictransferhydrogenation of diaryl ketones with ethanol as the hydrogen source and solvent. This reaction was applicable to various ortho-substituted diaryl keontes, affording benzhydrols in good yields and enantioselectivities. This protocol could be carried out in a gram scale under mild reaction conditions
使用手性 (NCP)Ir 配合物作为预催化剂,可以发现以乙醇为氢源和溶剂的二芳基酮的不对称转移氢化。该反应适用于各种邻位取代的二芳基酮,以良好的收率和对映选择性提供苯甲醇。该方案可以在温和的反应条件下以克级进行。通过合成 ( S )-新苯诺定的关键前体突出了催化体系的实用性。
<i>n</i>Bu<sub>4</sub>N<sup>+</sup>[Ag<sup>I</sup>(CF<sub>3</sub>)<sub>2</sub>]<sup>−</sup>: Trifluoromethylated Argentate Derived from Fluoroform and Its Reaction with (Hetero)Aryl Diazonium Salts
argentate nBu4N+[Ag(CF3)2]− 1 from fluoroform was described. The complex was stable in the solid state and in solution under an inert atmosphere. Treatment of a variety of (hetero)aryl diazonium tetrafluoroborates with nBu4N+[Ag(CF3)2]− 1 generated trifluoromethylated (hetero)arenes in good to excellent yields. Preliminary experiments were conducted, and a reasonable mechanism of the reaction was proposed
描述了从氟仿制备明确的三氟甲基化银酸盐n Bu 4 N + [Ag(CF 3 ) 2 ] - 1 。该配合物在惰性气氛下在固态和溶液中均稳定。用n Bu 4 N + [Ag(CF 3 ) 2 ] - 1处理各种(杂)芳基重氮四氟硼酸盐,生成三氟甲基化(杂)芳烃,收率良好至优异。进行了初步实验,提出了合理的反应机理。
Bigler,A.J. et al., European Journal of Medicinal Chemistry, 1977, vol. 12, p. 289 - 295
作者:Bigler,A.J. et al.
DOI:——
日期:——
A New Type of 1,4-Benzothiazepine Derivatives
作者:L. H. Sternbach、H. Lehr、E. Reeder、T. Hayes、N. Steiger