Heterocyclization Approach for Electrooxidative Coupling of Functional Primary Alkylamines with Aromatics
摘要:
A new approach for electrooxidative coupling of aromatic compounds and primary alkylamines bearing a functional group such as a hydroxyl group and an amino group was developed. The key to the success of the transformation is heterocydization of functional primary alkylamines. Treatment of primary alkylamines bearing a functional group with nitriles or their equivalents gives the corresponding heterocycles. The electrochemical oxidation of aromatic substrates in the presence of the heterocycles followed by chemical reaction under nonoxidative conditions gave the desired coupling products.
Efficient synthesis of SCF<sub>3</sub>-substituted tryptanthrins by a radical tandem cyclization
作者:Jincheng Guo、Yanan Hao、Gang Li、Ziwen Wang、Yuxiu Liu、Yongqiang Li、Qingmin Wang
DOI:10.1039/d0ob00233j
日期:——
we report a new, efficient and atom-economical strategy for the synthesis of SCF3-substituted tryptanthrin derivatives. These previously unreported derivatives were obtained by means of a radical tandem cyclization. The reaction was triggered by addition of a SCF3 radical to a carbon-carbon double bond and involved the formation of a C(sp3)-SCF3 bond, a C(sp2)-C bond, and a C(sp2)-N bond. This method
One-Pot Asymmetric Synthesis of Substituted Piperidines by Exocyclic Chirality Induction
作者:Yunfeng Chen、Cheng Zhong、Jeffrey L. Petersen、Novruz G. Akhmedov、Xiaodong Shi
DOI:10.1021/ol900708d
日期:2009.6.4
efficient one-pot synthesis of substituted piperidines was developed through nitroalkene, amine, and enone condensation. The transformation was suitable for a large group of substrates, giving excellent yields and diastereoselectivity. Reactions using chiral amines revealed a chirality induction through the unusual exocyclic stereochemistry control, producing enantiomeric pure piperidines in simple steps
Copper-Triggered Bioorthogonal Cleavage Reactions for Reversible Protein and Cell Surface Modifications
作者:Xin Wang、Yanjun Liu、Xinyuan Fan、Jie Wang、William Shu Ching Ngai、Heng Zhang、Jiaofeng Li、Gong Zhang、Jian Lin、Peng R. Chen
DOI:10.1021/jacs.9b05833
日期:2019.10.30
amines and phenol alcohols on small molecule drugs, protein side-chains as well as intact cell surface. For proof-of-concept, we employed such Cu(I)-BTTAA/dsProc and Cu(I)-BTTAA/dsPra pairs as a "tracelesslinker" strategy to construct cleavable ADCs to unleash cytotoxic compounds on cancercells in situ, and as a "reversible modification" strategy for cell surface engineering. Furthermore, by coupling
A Convenient Method for the Preparation of Primary Amines by the Use of Bisbenzenesulfenimide and Bis-<i>p</i>-chlorophenylsulfenimide
作者:Teruaki Mukaiyama、Takeo Taguchi、Mineo Nishi
DOI:10.1246/bcsj.44.2797
日期:1971.10
conditions by treating N-substituted bisarylsulfenimides with hydrochloric acid or mercaptan. The N-substituted bisarylsulfenimides were prepared in good yields by the reactions of lithium bisarylsulfenimide with alkyl halides or alkyl p-toluenesulfonates or by the addition reactions of bisarylsulfenimide to olefiniccompounds.
chloroperoxidase (CPO) to catalyze amino alcohol oxidations was investigated. The oxidations of compounds with different configurations with respect to the amine position towards hydroxyl – using H 2 O 2 and tert -butyl hydroperoxide ( t -BuOOH) – were analyzed in terms of the initial reaction rate, substrate conversion, and CPO operational stability. It was observed that the further the amino group from the hydroxyl
摘要 研究了氯过氧化物酶(CPO)催化氨基醇氧化的能力。使用 H 2 O 2 和叔丁基过氧化氢 (t-BuOOH),根据初始反应速率、底物转化率和 CPO 操作稳定性分析了具有不同构型的化合物在胺位置上向羟基的氧化。观察到氨基离羟基越远,初始反应速率越低。还检查了氨基保护基团和其他取代基(即甲基和羟基)的影响,揭示由于大取代基的影响,空间位阻增加。观察到的反应速率与 t-BuOOH 更高,而 CPO 与 H 2 O 2 更稳定。而且,由于酶活性受底物调节,因此必须逐案确定 CPO 稳定性。研究了 N -Cbz-3-氨基丙醇(Cbz,羧苄基)氧化成 N-Cbz-3-氨基丙醛。研究了反应介质、氨基醇初始浓度、过氧化物性质等主要操作条件。测定反应动力学,未观察到底物抑制。确定了生成的氨基醛与过氧化物之间化学反应的副产物,并提出了一种新的反应机理。最后,通过减少副反应和确定要解决的关键因素来实现生