与我们之前报道的锰同双核催化剂2a相比,单核锰前体3与醇钾组合的催化剂体系不仅可以用于酯化叔芳基酰胺,还可以用于酯化叔脂肪族酰胺。在3和钾醇盐的化学计量反应、动力学研究和密度泛函理论(DFT)计算的基础上,我们阐明了一种合理的反应机制,其中原位生成的锰-钾异双核物种协同激活酰胺的羰基部分和醇的OH部分。我们还详细揭示了之前的锰同双核体系2 a的反应机理,我们发现锰钾异双核配合物催化酰胺酯化的活化自由能(Δ G ≠)低于锰同双核体系的活化自由能(Δ G ≠ ) ,与实验结果一致。我们进一步应用我们的催化剂系统对伯胺和仲胺的乙酰基部分进行脱保护。
Manganese-Catalyzed α-Alkylation of Ketones, Esters, and Amides Using Alcohols
作者:Subrata Chakraborty、Prosenjit Daw、Yehoshoa Ben David、David Milstein
DOI:10.1021/acscatal.8b03720
日期:2018.11.2
bond-forming reactions via α-alkylation of ketones, amides, and esters, using primary alcohols. β-Alkylation of secondary alcohols by primary alcohols to obtain α-alkylated ketones is also reported. The reactions are catalyzed by a ( i Pr-PNP)Mn(H)(CO)2 pincer complex under mild conditions in the presence of (catalytic) base liberating water (and H2 in the case of secondary alcohol alkylation) as the sole
Ti-Catalyzed Diastereoselective Cyclopropanation of Carboxylic Derivatives with Terminal Olefins
作者:Jiabin Ni、Xiaowen Xia、Wei-Feng Zheng、Zhaobin Wang
DOI:10.1021/jacs.2c02360
日期:2022.5.4
cyclopropylamines from widely accessible carboxylic derivatives (acids, esters, amides) with terminal olefins. To the best of our knowledge, this method represents the first example of direct converting alkyl carboxylic acids into cyclopropanols. Distinct from conventional studies in Ti-mediated cyclopropanations with reactive alkyl Grignard reagents as nucleophiles or reductants, this protocol utilizes Mg
Use of Potassium β-Trifluoroborato Amides in Suzuki−Miyaura Cross-Coupling Reactions
作者:Gary A. Molander、Ludivine Jean-Gérard
DOI:10.1021/jo900968h
日期:2009.8.7
Potassium beta-trifluoroborato amides were prepared and used as successful partners in Suzuki-Miyaura reactions with various aryl chlorides, including electron-rich and electron-poor derivatives, as well as several heteroaryl chloride partners.
Esterification of Tertiary Amides: Remarkable Additive Effects of Potassium Alkoxides for Generating Hetero Manganese–Potassium Dinuclear Active Species
catalyst system of mononuclear manganese precursor 3 combined with potassiumalkoxide served as a superior catalyst compared with our previously reported manganese homodinuclear catalyst 2 a for esterification of not only tertiary aryl amides, but also tertiary aliphatic amides. On the basis of stoichiometric reactions of 3 and potassiumalkoxide salt, kinetic studies, and density functional theory (DFT) calculations
与我们之前报道的锰同双核催化剂2a相比,单核锰前体3与醇钾组合的催化剂体系不仅可以用于酯化叔芳基酰胺,还可以用于酯化叔脂肪族酰胺。在3和钾醇盐的化学计量反应、动力学研究和密度泛函理论(DFT)计算的基础上,我们阐明了一种合理的反应机制,其中原位生成的锰-钾异双核物种协同激活酰胺的羰基部分和醇的OH部分。我们还详细揭示了之前的锰同双核体系2 a的反应机理,我们发现锰钾异双核配合物催化酰胺酯化的活化自由能(Δ G ≠)低于锰同双核体系的活化自由能(Δ G ≠ ) ,与实验结果一致。我们进一步应用我们的催化剂系统对伯胺和仲胺的乙酰基部分进行脱保护。