[[(Ethoxycarbonyl)difluoromethyl]thio]phthalimide: A Shelf-Stable, Electrophilic Reagent with a Convertible Group for the Synthesis of Diversified Fluoroalkylthiolated Compounds
作者:Feng Shen、Panpan Zhang、Long Lu、Qilong Shen
DOI:10.1021/acs.orglett.7b00010
日期:2017.3.3
A shelf-stable and easily convertible reagent for the preparation of diversified fluoroalkylthiolated compounds, [[(ethoxycarbonyl)difluoromethyl]thio]phthalimide, was developed. [[(Ethoxycarbonyl)difluoromethyl]thio]phthalimide is an efficient electrophilic fluoroallylthiolating reagent that reacted with electron-rich heteroarenes/arenes, β-ketoesters, oxindoles, benzofuranones, and thiols. More importantly
Palladium-Catalyzed Chemoselective Activation of sp<sup>3</sup> vs sp<sup>2</sup> C–H Bonds: Oxidative Coupling To Form Quaternary Centers
作者:Gang Hong、Pradip D. Nahide、Uday Kumar Neelam、Peter Amadeo、Arjun Vijeta、John M. Curto、Charles E. Hendrick、Kelsey F. VanGelder、Marisa C. Kozlowski
DOI:10.1021/acscatal.9b00091
日期:2019.4.5
activation of alkyl C–H bonds vs arene C–H bonds with Pd(OAc)2 has been found to be generalizable to a number of nucleophilic substrates, allowing the formation of a range of hindered quaternary centers. The substrates share a common mechanistic path wherein Pd(II) initiates an oxidative dimerization. The resultant dimer modifies the palladium catalyst to favor activation of alkyl C–H bonds, in contrast to
Asymmetric Difluoromethylthiolation of Carbon Nucleophiles with Optically Pure Difluoromethylthiolating Reagents Derived from Camphorsultam
作者:He Zhang、Xiaolong Wan、Qilong Shen
DOI:10.1002/cjoc.201900298
日期:2019.10
The invention of a family of optically pure electrophilic difluoromethylthiolating reagents 9a–c based on the camphorsultam skeleton was described. These reagents reacted with a variety of soft carbonnucleophiles such as oxazolone, oxindole, benzolactone and β‐ketoester in good to excellent enantioselectivities.
BF<sub>3</sub>·OEt<sub>2</sub> catalyzed decarbonylative arylation/C–H functionalization of diazoamides with arylaldehydes: synthesis of substituted 3-aryloxindoles
作者:Sengodagounder Muthusamy、Ammasi Prabu
DOI:10.1039/d2ob00003b
日期:——
A metal-free BF3·OEt2 catalyzed direct decarbonylative arylation of diazoamides with readily accessible aryl aldehydesunder an open-air atmosphere was developed to afford 3-aryloxindoles via 1,2-aryl migration with high selectivity. The reaction offers an efficient pathway for 3-arylation of diazoamides under relatively mildconditions, which shows a high level of functional group tolerance of both
Catalytic Double Stereoinduction in Asymmetric Allylic Alkylation of Oxindoles
作者:Barryâ M. Trost、Yong Zhang
DOI:10.1002/chem.200902770
日期:2010.1.4
A highly regio‐, diastereo‐, and enantioselective allylicalkylation reaction of 3‐monosubstituted oxindoles catalyzed by molybdenum is described. The reaction is affected by the electronic and steric variations of the nucleophile. The use of appropriate N‐protecting group is particularly important for achieving high regio‐ and diastereoselectivity. Products from this reaction, containing vicinal quaternary‐tertiary
描述了钼催化的 3-单取代羟吲哚的高度区域、非对映和对映选择性烯丙基烷基化反应。该反应受到亲核试剂的电子和空间变化的影响。使用适当的 N 保护基团对于实现高区域和非对映选择性特别重要。该反应的产物含有邻位季-叔立构中心,是有价值的合成中间体,应该在生物碱合成中得到应用。