Fluorous reagents and scavengers versus solid-supported reagents and scavengers, a reaction rate and kinetic comparison

Ionic liquid-supported benzyl azide: an efficient soluble scavenger for alkynes

An ionic liquid functionalized with benzyl azide was synthesized and its synthetic utility was evaluated by scavenging excess alkynes in the synthesis of 2,4-disubstituted quinoline via the Povarov reaction.

Synthesis of arrays using low molecular weight MPEG-assisted Mitsunobu reaction

Triphenylphosphine tagged with a short poly-(ethyleneglycol)-ω-monomethyl ether chain (light MPEG, 10−16 ethylenoxy units, (M)TPP-G2) and an MPEG-tagged version of diethyl azodicarboxylate ((M)DEAD) have been used to prepare a 20 member library of esters, ethers, and sulfonamides, with cLogP's in the range of 1.4−5.7 on a 0.1 mmol scale. Removal of MPEG-tagged side products was achieved by MPEG-assisted solid-phase extraction (MSPE) on prepacked silica columns to give the products in good yield and high purity.

Microwave-Enhanced High-Speed Fluorous Synthesis

Increasing reaction speed and simplifying product purification are two major ways to improve the efficiency of organic synthesis. A new technology for high-speed solution-phase synthesis has been developed by combination of microwave heating and fluorous purification. This review describes different techniques for microwave-enhanced fluorous synthesis and their applications in Pd-catalyzed cross-coupling reactions, free-radical reactions, multicomponent reactions, and compound library synthesis.

Fluorous 2,4-Dichloro-1,3,5-triazines (F-DCTs) as Nucleophile Scavengers

1H,1H,2H,2H,3H,3H‐perfluoroundecanol‐ and 1H,1H,2H,2H‐perfluorodecanethiol‐displaced 2,4‐dichloro‐1,3,5‐triazines 1 and 2 are synthesized and used as nucleophile scavengers to remove thiols and amines from solution‐phase reactions. Two active sites on the triazine ring are able to remove two equivalents of nucleophiles. The purification of reaction mixtures is accomplished by plate‐to‐plate fluorous solid‐phase extraction or automated solid‐phase extraction on the RapidTrace system.