One-pot synthesis of sulfonamides from methyl sulfinates using ultrasound
摘要:
Room temperature ultrasonic irradiation of neat mixtures of methyl sulfinates and primary or secondary amines (1.5 equiv) produced sulfinamides, which on m-CPBA oxidation (in dichloromethane) were converted into the corresponding sulfonamides. The two steps can be accomplished in one pot, in good overall yields, when using secondary amines, but primary amines give better sulfonamide yields when the peracid oxidation is effected on the purified sulfinamide. This constitutes a mild, efficient, and potentially scalable route to sulfonamides, which obviates the use of water sensitive, often lachrymatory sulfonyl chlorides and large reagent excesses. (C) 2011 Elsevier Ltd. All rights reserved.
time-controlled highly selective C3- or C2-sulfinylation of pyrroles with sulfinamides is reported for the first time. The sulfinylation of indoles with sulfinamides using this protocol is oxidant-free and can be performed under obviously more feasible conditions (1.2 equiv. of indoles, 10 min) in comparison with the precedent procedure (3–20 equiv. of indoles, 16–18 h, ammonium persulfate as oxidant, hv). A
Efficient Synthesis of 3-(Arenesulfinyl)indoles in Water
作者:Y. Liu、Z. Y. Zhang、Y. Z. Ji、H. J. Li、Y. C. Wu
DOI:10.1134/s1070428021050109
日期:2021.5
sulfinylation of indoles with arylsulfinamides in water in the presence of trifluoroacetic acid as a promoter is described. The reaction occurs smoothly at room temperature under environmentally benign conditions without any catalyst, additive, ligand, or organic solvent. The developed sulfoxide synthetic protocol is attractive due to the use of water as the solvent and provides a novel and efficient route to
Visible-Light-Accelerated C−H Sulfinylation of Heteroarenes
作者:Andreas Uwe Meyer、Alexander Wimmer、Burkhard König
DOI:10.1002/anie.201610210
日期:2017.1.2
Heteroaromatic sulfoxides are a frequent structural motif in natural products, drugs, catalysts, and materials. We report a metal‐free visible‐light‐accelerated synthesis of heteroaromatic sulfoxides from sulfinamides and peroxodisulfate. The reaction proceeds at room temperature with blue‐light irradiation and allows the C−H sulfinylation of electron‐rich heteroarenes, such as pyrroles and indoles
Reaction of benzenesulfinyl azide with thiols and amines. Preparation of thiosulfinates and sulfinamides
作者:Tom J. Maricich、Christos N. Angeletakis
DOI:10.1021/jo00185a017
日期:1984.6
Experimental and Computational Evidence for the Formation of Iminopersulfinic Acids
作者:Edward L. Clennan、Ming-Fang Chen、Alexander Greer、Frank Jensen
DOI:10.1021/jo9800208
日期:1998.5.1
An experimental and computational study of the reactions of singlet oxygen with N-substituted sulfenamides is reported. Intermediates capable of epoxidizing norbornene were observed during the photooxidations of three sulfenamides. These results are used to argue for formation of iminopersulfinic acids. The structural integrity of two iminopersulfinic acids was supported by their successful location at the MP2/6-31G* level of theory. Furthermore, the inability to locate computationally significant persulfinimide precursors suggests that the iminopersulfinic acids form by enelike reactions involving near-simultaneous addition of singlet oxygen to sulfur and hydrogen abstraction.