“…In accord with literature, free CF 3 SO 2 Na reagent shows a singlet peak at −87.5 ppm. 14 When electric current of 1.1 F/mol was applied, the 19 F NMR signal of CF 3 SO 2 Na disappeared, indicating its complete consumption upon electrolysis. New peaks around −73.0 ppm appearance indicated new CF 3 species formation (Figure S4).…”
A general electrohemical
strategy for the combined trifluoromethylation/C(sp2)–H
functionalization using Langlois’ reagent
as the CF3 source under oxidant-free conditions was developed.
Using Mn salts as the redox mediator, this method provides an efficient
and sustainable means to access a variety of functionalized heterocycles
bearing a CF3 moiety. Detailed mechanistic studies are
consistent with the formation of CF3-bound high oxidation
state Mn species, suggesting a transition-metal-mediated CF3 transfer mechanism for this trifluoromethylation/C(sp2)–H functionalization process.
“…In accord with literature, free CF 3 SO 2 Na reagent shows a singlet peak at −87.5 ppm. 14 When electric current of 1.1 F/mol was applied, the 19 F NMR signal of CF 3 SO 2 Na disappeared, indicating its complete consumption upon electrolysis. New peaks around −73.0 ppm appearance indicated new CF 3 species formation (Figure S4).…”
A general electrohemical
strategy for the combined trifluoromethylation/C(sp2)–H
functionalization using Langlois’ reagent
as the CF3 source under oxidant-free conditions was developed.
Using Mn salts as the redox mediator, this method provides an efficient
and sustainable means to access a variety of functionalized heterocycles
bearing a CF3 moiety. Detailed mechanistic studies are
consistent with the formation of CF3-bound high oxidation
state Mn species, suggesting a transition-metal-mediated CF3 transfer mechanism for this trifluoromethylation/C(sp2)–H functionalization process.
“…23 Thus, treatment of sulfonates 3a, 3ab and 3ac with DBU and a thiol in dichloromethane led to a smooth and high yielding transformation to 11, presumably via an elimination-addition sequence (Table 4, entries 1-6). As the elimination of sulfones to give alkenes is well documented, 24 the elimination conditions were applied to sulfones 3ad and 3ae (Table 4, entries 7-10) and were successful, albeit in poorer yields. We believe the inferior yields observed for b-keto-sulfones 3ad and 3ae highlight a specific advantage of b-keto-sulfonates 3a, 3ab and 3ac.…”
Herein we report a mild, facile method for the preparation of 1,4-keto-sulfonates and sulfones on water. Further synthetic manipulations can result in products that are not readily accessed by hydroacylation of electron rich alkenes.
“…Concurrently, Langlois and co-workers developed sustainable and mild reaction conditions to synthesize trifluoromethane-sulfinate (triflinate) salts via β-elimination of aliphatic triflones using NaOMe in MeOH ( Scheme 12C ). 45 As a result, this reagent is well known as the Langlois reagent.…”
This review provides a unique and comprehensive overview of sodium sulfinates for synthesizing many valuable sulfur-containing compounds, such as thiosulfonates, sulfonamides, sulfides, sulfones, allyl sulfones, vinyl sulfones and β-keto sulfones.
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