Visible Light-Induced Trifluoromethylation and Perfluoroalkylation of Cysteine Residues in Batch and Continuous Flow
作者:Cecilia Bottecchia、Xiao-Jing Wei、Koen P. L. Kuijpers、Volker Hessel、Timothy Noël
DOI:10.1021/acs.joc.6b01031
日期:2016.8.19
We report a visible light-induced trifluoromethylation and perfluoroalkylation for cysteine conjugation using Ru(bpy)32+ as photocatalyst and inexpensive RFI as coupling partner. The protocol allows the introduction of a variety of perfluoro alkyl groups (C1–C10) and a CF2COOEt moiety. The reaction is high yielding (56–94% yield) and fast (2 h in batch, 12 examples). Process intensification in a photomicroreactor
我们报告可见光诱导的三氟甲基化和全氟烷基化的半胱氨酸偶联使用Ru(bpy)3 2+作为光催化剂和廉价的R F I作为偶联伙伴。该协议允许引入各种全氟烷基(C1-C10)和CF 2 COOEt部分。该反应收率高(56-94%),速度快(分批2 h,12个实例)。在光微反应器中的过程强化加速了反应(5分钟反应时间)并增加了产率(8个实施例)。量子产率研究支持自由基链机制。
Decarbonylative Approach to the Synthesis of Enamides from Amino Acids: Stereoselective Synthesis of the (<i>Z</i>)-Aminovinyl-<scp>d</scp>-Cysteine Unit of Mersacidin
作者:Pablo García-Reynaga、Angela K. Carrillo、Michael S. VanNieuwenhze
DOI:10.1021/ol203399x
日期:2012.2.17
The Pd- and Ni-promoted decarbonylation of aminoacid thioesters proceeds smoothly to yield enamides. The synthesis of the (S)-(Z)-AviMeCys subunit of mersacidin, an MRSA-active lantibiotic, via this approach, is described.
Pd 和 Ni 促进的氨基酸硫酯脱羰反应顺利进行,生成烯酰胺。描述了通过这种方法合成MRSA 活性羊毛硫抗生素 mersacidin的 ( S )-( Z )-AviMeCys 亚基。
Probing the Frontiers of Glycoprotein Synthesis: The Fully Elaborated β-Subunit of the Human Follicle-Stimulating Hormone
作者:Pavel Nagorny、Neeraj Sane、Bernhard Fasching、Baptiste Aussedat、Samuel J. Danishefsky
DOI:10.1002/anie.201107482
日期:2012.1.23
β‐subunit of the human follicle‐stimulating hormone (hFSH) displaying a N‐linked consensus sequence oligosaccharide at each of the two wild‐type sites was synthesized. The glycoprotein has been designed with acetamidomethyl protected cysteine residues, anticipating folding and association with the α‐subunit. This represents the largest realistically glycosylated homogeneous glycoprotein obtained by using
雄心勃勃的任务:合成了在两个野生型位点上显示 N 连接共有序列寡糖的人卵泡刺激素 (hFSH) 的 β 亚基。该糖蛋白被设计为具有乙酰氨基甲基保护的半胱氨酸残基,预期折叠并与 α 亚基结合。这代表了通过严格使用化学方法获得的最大的实际糖基化均质糖蛋白。
Visible‐Light‐Mediated Selective Arylation of Cysteine in Batch and Flow
作者:Cecilia Bottecchia、Maarten Rubens、Smita B. Gunnoo、Volker Hessel、Annemieke Madder、Timothy Noël
DOI:10.1002/anie.201706700
日期:2017.10.2
Chemical modifications of peptides: The mild visible-light-mediated arylation of cysteine relies on the use of eosin Y as a metal-free photocatalyst and aryldiazonium salts as arylating agents. The batch and flow protocol afforded a series of arylated cysteine derivatives and arylated cysteine-containing dipeptides. A model peptide has been chemoselectively arylated under biocompatible reaction conditions
Stereocontrolled Synthesis of α-Amino-α′-alkoxy Ketones by a Copper-Catalyzed Cross-Coupling of Peptidic Thiol Esters and α-Alkoxyalkylstannanes
作者:Hao Li、Anyu He、John R. Falck、Lanny S. Liebeskind
DOI:10.1021/ol201330j
日期:2011.7.15
A stereocontrolled synthesis of α-amino-α′-alkoxy ketones is described. This pH-neutral copper(I) thiophene-2-carboxylate (CuTC)-catalyzed cross-coupling of amino acid thiolesters and chiral nonracemic α-alkoxyalkylstannanes gives α-amino-α′-alkoxy ketones in good to excellent yields with complete retention of configuration at the α-amino- and α-alkoxy-substituted stereocenters.