Mild and General Method for the Synthesis of Sulfonamides
作者:José García Ruano、Francisco Yuste、Alejandro Parra、Virginia Mastranzo
DOI:10.1055/s-2007-1000850
日期:2008.1
lowed by 3-chloroperoxybenzoic acid oxidation of the resulting sul- finamides provides primary, secondary, and tertiary alkane-, arene- and heteroarenesulfonamides in high yields. This constitutes a mild and facile experimental protocol that avoids the use of hazardous, unstable, or volatile reagents and does not affect the configurational stability of the amines
'One-Pot' Synthesis of Sulphinic Esters from Disulphides
作者:Peter Brownbridge、Ian C. Jowett
DOI:10.1055/s-1988-27535
日期:——
Alkane- and arenesulphinic esters can conveniently be prepared from disulphides and alcohols using N-bromosuccinimide or a combination of 3-chloroperoxybenzoic acid and N-bromosuccinimide.
The sulfinylation reaction of aromatic and hetero-aromatic compounds with sulfinic esters as electrophiles has been investigated in different ionic liquids and by means of different Lewis acid salts in order to get moderate to good yields of asymmetrical sulfoxides. Mixtures of 1-butyl-3-methylimidazolium chloride and aluminum chloride were found to be the most efficient and recyclable reaction framework
Copper‐Catalyzed Olefination of 4‐CF
<sub>3</sub>
‐Substituted Cyclohexadienones Using Sulfonylmethyl Isocyanides: An Electrostatic Repulsion‐Controlled Regioselectivity Switch Strategy
作者:Seungwon Lee、Mohamed Ahmed Abozeid、Hun Young Kim、Kyungsoo Oh
DOI:10.1002/adsc.202201333
日期:2023.2.21
was shown to exert a pronounced electrostatic repulsion effect to give the olefination products via a preferential [3+2] cycloaddition with the ketone moiety followed by a facile fragmentation of transient oxazoline intermediates. The current Cu(II)-catalyzed olefination of 4-CF3-substituted cyclohexadienones demonstrates the reaction dichotomy involving a CF3-controlled 1,2-addition over a Van Leusen
One-pot synthesis of sulfonamides from methyl sulfinates using ultrasound
作者:José L. García Ruano、Alejandro Parra、Leyre Marzo、Francisco Yuste、Virginia M. Mastranzo
DOI:10.1016/j.tet.2011.02.060
日期:2011.4
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.