由 CO 2构建更高 C ≥ 2 的化合物构成了一个有吸引力的转变,其灵感来自大自然构建碳水化合物的策略。然而,使用对环境无害的还原剂控制二氧化碳形成的 C-C 键仍然是一项重大挑战。在这方面,CO 2还原二聚成草酸盐是一种重要的模型反应,能够研究这种最简单的 CO 2偶联反应的机理。在此,我们提出了在 CO 2还原过程中遇到的常见陷阱,尤其是其还原耦合,基于已建立的 CO 2转化协议变成草酸盐。此外,我们提供了一个例子来系统地评估这些反应。基于我们的工作,我们强调了使用合适的正交分析方法的重要性,并提高了对氧化反应的认识,这些氧化反应同样会导致草酸盐的形成而不掺入 CO 2。这些结果可以确定关键参数,这些参数可用于定制未来的催化系统,并将促进整个领域的进步。
Synthesis and anti-inflammatory activity of acetylsalicylamino acids and peptides
作者:Sh. Kh. Khalikov、M. Kodirov、S. V. Alieva
DOI:10.1007/s10600-006-0079-5
日期:2006.3
Several water-soluble acetylsalicylamino acids and peptides containing neutral and acidic amino acids were synthesized and investigated for anti-inflammatory activity.
合成了若干种含水溶性乙酰水杨酰的氨基酸及中性和酸性氨基酸的肽,并对其抗炎活性进行了研究。
Memory of Chirality of Tertiary Aromatic Amides: A Simple and Efficient Method for the Enantioselective Synthesis of Quaternary α-Amino Acids
A new methodology for the asymmetric synthesis of quaternary alpha-substituted amino acids using memory of chirality has been developed. The strategy utilizes the dynamic axial chirality of tertiary aromatic amides to memorize the initial chirality of an alpha-amino acid during an enolization step. Starting from five different l-amino acids, the corresponding oxazolidin-5-ones containing a tertiary
Asymmetric cyanosilylation of alkynyl ketones with the catalyst systems consisting of amino acid/2,2′‐bis(diphenylphosphino)‐1,1′‐binaphthyl (BINAP)/ruthenium(II) complex and lithium phenoxide (Ru⋅Li cat.) was studied. The reaction was conducted in tert‐butyl methyl ether (TBME) at −78 °C with a substrate‐to‐catalyst molar ratio (S/C) as high as 2000. A series of simple and functionalized ketones was converted
Natural amino acid salt catalyzed aldol reactions of isatins with ketones: highly enantioselective construction of 3-alkyl-3-hydroxyindolin-2-ones
作者:Gong Chen、Yuan Ju、Tao Yang、Zicheng Li、Wei Ang、Zitai Sang、Jie Liu、Youfu Luo
DOI:10.1016/j.tetasy.2015.07.008
日期:2015.9
The asymmetric synthesis of 3-alkyl-3-hydroxyindolin-2-ones via direct aldolreaction of isatin with ketones catalyzed by natural amino acid salts is described, in which the phenylalanine lithium salt was found to be the best catalyst. This strategy was then applied to a variety of isatin and ketone substrates and the corresponding aldol products were obtained in excellent yields (up to 97%) with good
Rapid and Mild Synthesis of Amino Acid <i>N</i>
-Carboxy Anhydrides: Basic-to-Acidic Flash Switching in a Microflow Reactor
作者:Yuma Otake、Hiroyuki Nakamura、Shinichiro Fuse
DOI:10.1002/anie.201803549
日期:2018.8.27
Polymerization of N‐carboxyanhydrides (NCAs) is the primary process used to prepare polypeptides. The synthesis of various pure NCAs is key to the efficient synthesis of polypeptides. The only practical method that can be used to synthesize NCAs requires harsh acidic conditions that make acid‐labile substrates unusable and results in an undesired ring opening of NCAs. Basic‐to‐acidic flash switching