Rapid synthesis of etherimides via catalytic arylation of silylated phenols
摘要:
We report here a rapid and efficient method for the synthesis of aromatic etherimides from silylated phenols and 4-fluorophthalimides catalyzed by CsF. Reaction times are a few minutes and products are easily purified requiring no column chromatography. (C) 1999 Elsevier Science Ltd. All rights reserved.
作者:Jiajia Dong、K. Barry Sharpless、Luke Kwisnek、James S. Oakdale、Valery V. Fokin
DOI:10.1002/anie.201403758
日期:2014.9.1
High‐molecular‐weight polysulfates are readily formed from aromatic bis(silyl ethers) and bis(fluorosulfates) in the presence of a base catalyst. The reaction is fast and proceeds well under neat conditions or in solvents, such as dimethyl formamide or N‐methylpyrrolidone, to provide the desired polymers in nearly quantitative yield. These polymers are more resistant to chemical degradation than their
Regioselective Synthesis of Fluorosulfonyl 1,2,3-Triazoles from Bromovinylsulfonyl Fluoride
作者:Joice Thomas、Valery V. Fokin
DOI:10.1021/acs.orglett.8b01309
日期:2018.7.6
A regioselective metal-free preparation of 4-fluorosulfonyl 1,2,3-triazoles from organic azides and a hitherto underexplored bromovinylsulfonyl fluoride building block is described. This reaction is very general and was extended to the synthesis of various sulfonates, sulfonamides, and sulfonic acid derivatives of triazoles and other azole heterocycles which would otherwise be difficult to access by
[EN] POLYMERIZATION OF SILYL- AND FLUORO-CONTAINING MONOMERS<br/>[FR] POLYMÉRISATION DE MONOMÈRES CONTENANT DU FLUOR ET DU SILYLE
申请人:SCRIPPS RESEARCH INST
公开号:WO2016209920A1
公开(公告)日:2016-12-29
Condensation of fluoro-substituted and silyl-substituted monomers provides polymers suitable for use, e.g., as engineering polymers. A monomer composition is condensed in the presence of a bifluoride or poly(hydrogen fluoride) fluoride salt. The monomer composition contains a compound of formula F-X-F and a compound of formula (R1)3Si-Z-Si(R1)3, and forms an alternating X-Z polymer chain and a silyl fluoride byproduct. X has the formula -A(-R2-A)n -; each A is SO2, C(=O), or Het; R2 is an organic moiety; n is 0 or 1; Het is an aromatic nitrogen heterocycle; Z has the formula -L-R3-L-; each L is O, S, or N(R4); and each R3 is an organic moiety, and R4 comprises H or an organic moiety.
The SuFEx‐based polycondensation between bisalkylsulfonyl fluorides (AA monomers) and bisphenol bis(t‐butyldimethylsilyl) ethers (BB monomers) using [Ph3P=N−PPh3]+[HF2]− as the catalyst is described. The AA monomers were prepared via the highly reliable Michael addition of ethenesulfonyl fluoride and amines/anilines while the BB monomers were obtained from silylation of bisphenols by t‐butyldimethylsilyl
A rapid synthesis of beta-arylethenesulfonyl fluorides is realized using ligand-accelerated Pd(II)-catalyzed nondirected C-H alkenylation of simple arenes. The newly developed electron-deficient 2-pyridone ligand is crucial for this transformation with arenes as limiting reagent. This protocol features a broad substrate scope and good functional group tolerance. Late-stage functionalization of various pharmaceuticals and their further click manipulations demonstrate this procedure to be highly valuable.