Continuous-flow processes for the S-alkynylation of cysteine-containing peptides and thioglycosides under catalyst-free, oxidant-free and mild conditions
An efficient and unprecedented palladium‐catalyzed S‐glycosylation reaction of a range of alkenyl and alkynyl halides by using thiosugars as nucleophile partners has been established. With palladium diacetate in combination with Xantphos as the catalytic system, a variety of β‐alkenylthioglycosides as well as β‐alkynylthioglycosides can be prepared in good to excellent yields. The efficiency of this
Electrochemical nickel-catalyzed Migita cross-coupling of 1-thiosugars with aryl, alkenyl and alkynyl bromides
作者:Mingxiang Zhu、Mouad Alami、Samir Messaoudi
DOI:10.1039/d0cc01126f
日期:——
Here we report a simple route towards the synthesis of thioglycosides, in which electrochemical cross-coupling is used to form a S-C glycosidic bond from protected and unprotected thiosugars with functionalized aryl bromides under base free conditions. The reaction manifold that we report here demonstrates the power of electrochemistry to access highly complex glycosides under mild conditions.
Photochemical Dual-Catalytic Synthesis of Alkynyl Sulfides
作者:Jeffrey Santandrea、Clémentine Minozzi、Corentin Cruché、Shawn K. Collins
DOI:10.1002/anie.201705903
日期:2017.9.25
Catalytic partnership: A photochemical dual-catalytic cross-coupling to form alkynyl sulfides through C(sp)−S bond formation is promoted by a carbazole-based photocatalyst using continuous flow techniques in short reaction times (50–96 %, 30 min). In addition, incorporation of an alkynyl sulfide functional group into a macrocyclic scaffold was demonstrated as the first application of photoredox/nickel