Sulfur(VI) Fluoride Exchange (SuFEx): Another Good Reaction for Click Chemistry
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- 11 August 2014
- journal article
- review article
- Published by Wiley in Angewandte Chemie-International Edition
- Vol. 53 (36), 9430-9448
- https://doi.org/10.1002/anie.201309399
Abstract
Aryl sulfonyl chlorides (e.g. Ts‐Cl) are beloved of organic chemists as the most commonly used SVI electrophiles, and the parent sulfuryl chloride, O2SVICl2, has also been relied on to create sulfates and sulfamides. However, the desired halide substitution event is often defeated by destruction of the sulfur electrophile because the SVICl bond is exceedingly sensitive to reductive collapse yielding SIV species and Cl−. Fortunately, the use of sulfur(VI) fluorides (e.g., R‐SO2‐F and SO2F2) leaves only the substitution pathway open. As with most of click chemistry, many essential features of sulfur(VI) fluoride reactivity were discovered long ago in Germany. 6a Surprisingly, this extraordinary work faded from view rather abruptly in the mid‐20th century. Here we seek to revive it, along with John Hyatt’s unnoticed 1979 full paper exposition on CH2CH‐SO2‐F, the most perfect Michael acceptor ever found. 98 To this history we add several new observations, including that the otherwise very stable gas SO2F2 has excellent reactivity under the right circumstances. We also show that proton or silicon centers can activate the exchange of SF bonds for SO bonds to make functional products, and that the sulfate connector is surprisingly stable toward hydrolysis. Applications of this controllable ligation chemistry to small molecules, polymers, and biomolecules are discussed.This publication has 214 references indexed in Scilit:
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