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Trifluoromethanesulfonic anhydride is used to convert phenols and imine into triflic ester and NTf group. It is a strong electrophile used for the introduction of triflyl group in chemical synthesis. It serves as a reagent in the preparation of alkyl and vinyl triflates, and for the stereoselective synthesis of mannosazide methyl uronate donors. It acts as a catalyst for glycosylation with anomeric hydroxy sugars to prepare polysaccharides.
For examples of preparation of alkyl and aryl triflates, and use of the latter in the Stille coupling reaction, see: Org. Synth. Coll., 6, 324 (1988); 9, 553 (1998). Alkyl triflates undergo solvolysis reactions between five and seven powers of ten times more rapidly than the corresponding halides or tosylates: J. Am. Chem. Soc., 97, 6478 (1975); Angew. Chem. Int. Ed., 9, 521 (1970). For a review of the chemistry of triflate esters, see: Synthesis, 85 (1982).
Enolizable carbonyl compounds in the presence of base can be converted to vinyl (enol) triflates: Synthesis, 85 (1982); Org. Synth. Coll., 6, 757 (1988). For conditions employing preferred base, 2,6-Di-tert-butyl-4-methylpyridine, L14143, see: Org. Synth. Coll., 8, 97, 126 (1993). Enol triflates behave as a source of vinyl cations. For reviews, see: Angew. Chem. Int. Ed., 17, 333 (1978); Acc. Chem. Res., 11, 107 (1978); 15, 348 (1982); 21, 147 (1988).
For formation of keteniminium triflates, see N,N-Dimethylacetamide, A10924.
The Ritter reaction is normally most successful with tertiary alcohols. In contrast, a useful variation allows conversion of primary or secondary alcohols to amides in good yield: Tetrahedron Lett., 30, 581 (1989):
For use in the Vilsmeier formylation of less active substrates, see N,N-Dimethylformamide, A13547.
Triflic anhydride has also been found to promote the nitration of arenes, even deactivated ones, under mild conditions: Synthesis, 1087 (1992).
For a review of chemical transformations induced by the reagent, see: Tetrahedron, 56, 3077 (2000). For a brief feature on uses in synthesis, see: Synlett, 390 (2004).
Dadgar, M.; Kalkhorani, N. M. Efficient and practical one-pot route to synthesise quinazolin4 (3H)-ones using trifluoromethanesulfonic anhydride and 2-chloropyridine. J. Chem. Res. 2015, 39 (2), 120-122.
Huang, P. Q.; Lang, Q. W.; Wang, A. E.; Zheng, J. F. Direct reductive coupling of secondary amides: chemoselective formation of vicinal diamines and vicinal amino alcohols. Chem. Commun. 2015, 51 (6), 1096-1099.
Gefahrenhinweise (EU): H314-H318
Causes severe skin burns and eye damage. Causes serious eye damage.
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