Trifluoromethanesulfonyl azide as a bifunctional reagent for metal-free azidotrifluoromethylation of unactivated alkenes
作者:Hong-Gui Huang、Weishuang Li、Dayou Zhong、Hu-Chong Wang、Jing Zhao、Wen-Bo Liu
DOI:10.1039/d0sc06473d
日期:——
Vicinal trifluoromethyl azides have widespread applications in organic synthesis and drug development. However, their preparation is generally limited to transition-metal-catalyzed three-component reactions. We report here a simple and metal-free method that rapidly provides these buildingblocks from abundant alkenes and trifluoromethanesulfonyl azide (N3SO2CF3). This unprecedented two-component reaction
邻位三氟甲基叠氮化物在有机合成和药物开发中具有广泛的应用。然而,它们的制备通常限于过渡金属催化的三组分反应。我们在这里报告了一种简单且无金属的方法,该方法可快速从丰富的烯烃和三氟甲磺酰叠氮化物(N 3 SO 2 CF 3)提供这些结构单元。这种前所未有的两组分反应采用了容易获得的N 3 SO 2 CF 3作为双功能试剂,可同时引入CF 3和N 3族避免使用它们昂贵且低原子的经济前体。宽泛的官能团,包括与生物有关的杂环和氨基酸,都可以耐受。该方法的应用通过放大合成(5 mmol),产物衍生化为含CF 3的药用化学图案以及天然产物和药物衍生物的后期修饰而得到进一步证明。
Cobalt-Catalyzed Markovnikov-Selective Radical Hydroacylation of Unactivated Alkenes with Acylphosphonates
作者:Benxiang Zhang、Jiayan He、Yi Li、Tao Song、Yewen Fang、Chaozhong Li
DOI:10.1021/jacs.1c02629
日期:2021.4.7
Acylphosphonates having the 5,5-dimethyl-1,3,2-dioxophosphinanyl skeleton are developed as efficient intermolecular radical acylation reagents, which enable the cobalt-catalyzed Markovnikov hydroacylation of unactivatedalkenes at room temperature under mild conditions. The protocol exhibits broad substrate scope and wide functional group compatibility, providing branched ketones in satisfactory yields
A mild, versatile and efficient method for the regioselective hydrodifluoromethylation of unactivated alkenes has been developed. This Ag-mediated Csp(3)-CF2 bond forming reaction provides easy access to a variety of vicinal alpha-difluoroacetate-containing alkanes.
Nickel-Catalyzed Enantioconvergent Reductive Hydroalkylation of Olefins with α-Heteroatom Phosphorus or Sulfur Alkyl Electrophiles
作者:Shi-Jiang He、Jia-Wang Wang、Yan Li、Zhe-Yuan Xu、Xiao-Xu Wang、Xi Lu、Yao Fu
DOI:10.1021/jacs.9b09415
日期:2020.1.8
bond formation reactions have been made in recent years through the use of transition-metal-catalyzed cross-couplingreactions of racemic secondary alkyl electrophiles with organometallic reagents. Herein, we report a general process for the asymmetric construction of alkyl-alkyl bonds adjacent to heteroatoms, namely, a nickel-catalyzed enantioconvergent reductive hydroalkylation of olefins with α-heteroatom
Hydrophosphonodifluoromethylation of Alkenes via Thiyl-Radical/Photoredox Catalysis
作者:Wenhao Huang、Jingzhi Chen、Daocheng Hong、Wenxin Chen、Xu Cheng、Yuxi Tian、Guigen Li
DOI:10.1021/acs.joc.7b02354
日期:2018.1.19
Visible-light-induced catalytic hydrophosphonodifluoromethylation of mono- and disubstituted alkenes using bromodifluoromethanephosphonate with a Hantzsch ester as the terminal reductant is reported. The combination of thiyl-radical catalysis with photoredoxcatalysis is important for achieving good chemoselectivity and high yields.