<sup>18</sup>F-Trifluoromethylation of Unmodified Peptides with 5-<sup>18</sup>F-(Trifluoromethyl)dibenzothiophenium Trifluoromethanesulfonate
作者:Stefan Verhoog、Choon Wee Kee、Yanlan Wang、Tanatorn Khotavivattana、Thomas C. Wilson、Veerle Kersemans、Sean Smart、Matthew Tredwell、Benjamin G. Davis、Véronique Gouverneur
DOI:10.1021/jacs.7b10227
日期:2018.2.7
18F-labeling of 5-(trifluoromethyl)-dibenzothiophenium trifluoromethanesulfonate, commonly referred to as the Umemoto reagent, has been accomplished applying a halogen exchange 18F-fluorination with 18F-fluoride, followed by oxidative cyclization with Oxone and trifluoromethanesulfonic anhydride. This new 18F-reagent allows for the direct chemoselective 18F-labeling of unmodified peptides at the thiol cysteine
diazoacetates with cysteine residues that enabled metal‐free, S−H functionalization under visible‐light conditions. Moreover, this process could be intensified by a continuous‐flow photomicroreactor on the acceleration of the reaction (6.5 min residence time). The batch and flow protocols described were applied to obtain a wide range of functionalized cysteine derivatives and cysteine‐containing dipeptides
Continuous-flow processes for the <i>S</i>-alkynylation of cysteine-containing peptides and thioglycosides under catalyst-free, oxidant-free and mild conditions
Selective S-alkynylation of cysteine-containing peptides and 1-thioglycoside residues was developed using continuous flow.
含半胱氨酸肽和1-硫代糖苷残基的选择性S-炔基化反应已经在连续流条件下开发。
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
report the design and synthesis of hypervalent trifluoromethylthio-iodine(III) reagent 1 and the elucidation of its structure by NMR spectroscopy and X-ray crystallography. The trifluoromethylthiolation reactions of 1 with various nucleophiles were explored, and this compound was found to be a versatile electrophilicreagent for the transfer of a trifluoromethylthio group (-SCF3). The hydrogen-bonding