β-氨基酸经常被发现是许多生物活性分子、药物和天然产物中的重要成分。特别是,由于它们提高了代谢稳定性,它们被广泛用于构建生物活性肽和肽模拟物。尽管建立了许多用于制备 β-氨基酸衍生物的方法,但这些方法中的大多数都需要金属介导的预功能化底物的多步操作。在这里,我们公开了一种无金属、能量转移的高区域选择性分子间氨基羧化反应,用于将胺和酯官能团单步安装到烯烃或(杂)芳烃中。开发了一种双功能肟草酸酯以同时产生以 C 为中心的酯和以 N 为中心的亚氨基自由基。
[Cu(NHC)]-Catalyzed C−H Allylation and Alkenylation of both Electron-Deficient and Electron-Rich (Hetero)arenes with Allyl Halides
作者:Weilong Xie、Sukbok Chang
DOI:10.1002/anie.201510180
日期:2016.1.26
a [Cu(NHC)] (NHC=N‐heterocyclic carbene) catalyst is disclosed for the efficient C−H allylation of polyfluoroarenes using allyl halides in benzene at room temperature. The same catalyst system also promotes an isomerization‐induced alkenylation of initially the generated allyl arenes when the reaction is run in tetrahydrofuran. Significantly, not only electron‐deficient but also electron‐rich (hetero)arenes
[EN] N-SUBSTITUTED ACRYLAMIDE DERIVATIVE AS DHODH INHIBITOR, AND PREPARATION AND USE THEREOF<br/>[FR] DÉRIVÉ D'ACRYLAMIDE N-SUBSTITUÉ EN TANT QU'INHIBITEUR DE DHODH, SA PRÉPARATION ET SON UTILISATION<br/>[ZH] 作为DHODH抑制剂的N-取代丙烯酰胺衍生物及其制备和用途
Titanium Reagents for the Synthesis of 2-Substituted Benzo[<i>b</i>]thiophenes on the Solid Phase
作者:Christine F. Roberts、Richard C. Hartley
DOI:10.1021/jo049344o
日期:2004.9.1
Titanium(IV) benzylidenes (Schrock carbenes) bearing a masked sulfur nucleophile in the ortho position were generated from thioacetals with use of low-valent titanocene complex Cp2Ti[P(OEt)3]2 and alkylidenated Merrifield resin-bound esters to give enol ethers. Treatment of the resin-bound enol ethers with a 5:5:90 mixture of TFA, TFAA, and dichloromethane led to cleavage from resin, removal of the
使用低价二茂钛配合物Cp 2 Ti [P(OEt)3 ] 2和烷基化的Merrifield树脂结合的酯从硫缩醛中生成在邻位带有掩蔽的硫亲核试剂的钛(IV)苄叉基(Schrock carbenes)烯醇醚。用TFA,TFAA和二氯甲烷的5:5:90混合物处理与树脂结合的烯醇醚,导致从树脂上裂解,除去叔丁基二甲基甲硅烷基(TBDMS)保护基,并伴随环化反应完成无痕固体苯并噻吩的相合成(SPS)。将连接基的性质从酸稳定的转变为酸敏感的,确保了良好的纯度。
Photochemical single-step synthesis of β-amino acid derivatives from alkenes and (hetero)arenes
energy-transfer enabled highly regioselective intermolecular aminocarboxylation reaction for the single-step installation of both amine and ester functionalities into alkenes or (hetero)arenes. A bifunctional oxime oxalate ester was developed to simultaneously generate C-centred ester and N-centred iminyl radicals. This mild method features a remarkably broad substrate scope (up to 140 examples) and excellent tolerance
β-氨基酸经常被发现是许多生物活性分子、药物和天然产物中的重要成分。特别是,由于它们提高了代谢稳定性,它们被广泛用于构建生物活性肽和肽模拟物。尽管建立了许多用于制备 β-氨基酸衍生物的方法,但这些方法中的大多数都需要金属介导的预功能化底物的多步操作。在这里,我们公开了一种无金属、能量转移的高区域选择性分子间氨基羧化反应,用于将胺和酯官能团单步安装到烯烃或(杂)芳烃中。开发了一种双功能肟草酸酯以同时产生以 C 为中心的酯和以 N 为中心的亚氨基自由基。