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。
Enantioselective Synthesis of Quaternary Δ<sup>4</sup>
- and Δ<sup>5</sup>
-Dehydroprolines Based on a Two-Step Formal [3+2] Cycloaddition of α-Aryl and α-Alkyl Isocyano(thio)acetates with Vinyl Ketones
作者:Amaiur Odriozola、Mikel Oiarbide、Claudio Palomo
DOI:10.1002/chem.201703526
日期:2017.9.18
of optically active quaternary Δ4‐ and Δ5‐dehydro prolines is developed based on the first catalytic enantioselective conjugateaddition of α‐substituted isocyano(thio)acetates to vinyl ketones that is general for both α‐aryl and α‐alkyl isocyano(thio)acetates. The new tetrasubstituted C−N stereocenter is formed without the need of any metal salt due to a bifunctional tertiary amine/squaramide catalyst
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。
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
Application of dehydroalanine as a building block for the synthesis of selenocysteine-containing peptides
作者:Kishorkumar M. Reddy、Govindasamy Mugesh
DOI:10.1039/c8ra09880h
日期:——
the interesting redox properties of the selenium atom in peptides and proteins play crucial roles in redox catalysis. However, the chemical synthesis of Sec-containing peptides has been a difficult task. In this paper, we report on a new method for the synthesis of Sec and Sec-containing peptides using dehydroalanine (Dha) as a buildingblock.