herein an iridium‐catalyzed direct C−H activation/ C−N bond formation reaction of benzenesulfonamides with sulfonyl azides. The amidation reaction provides a protocol for the synthesis of 2‐aminobenzesulfonamides in good to excellent yields. This strategy features a wide substrate scope, tolerates a broad range of functional groups underexternaloxidant‐freeconditions and only releases molecular nitrogen
An efficient Rh(iii)-catalyzed ortho-selective C–H activation and tandem oxidative olefination-cyclization of aryl sulfonamides is described. The protocol has been applied to various substrates with good functional group tolerance.
A rhodium(III)-catalyzed sulfonamide directed ortho C–H carbenoid functionalization has been developed with good yields. This method is attractive due to its broad substrate scope, and enables derivation of diverse biologically active sulfonamide structures and late-stage modification of sulfa drugs.
Regioselective Ortho Olefination of Aryl Sulfonamide via Rhodium-Catalyzed Direct C–H Bond Activation
作者:Weijia Xie、Jie Yang、Baiquan Wang、Bin Li
DOI:10.1021/jo5015239
日期:2014.9.5
Rh(III)-catalyzed orthoC–H olefination of aryl sulfonamide directed by the SO2NHAc group is reported. This oxidative coupling process is achieved highly efficiently and selectively with a broad substrate scope. The reactions of N-tosylacetamide with acrylate esters afford ortho-alkenylated benzofused five-membered cyclic sulfonamides, whereas styrenes provide the direct diolefination products.
Rhodium-catalyzed direct C–H bond alkynylation of aryl sulfonamides with bromoalkynes
作者:Hongcen Hou、Yongli Zhao、Shouzhi Pu、Junmin Chen
DOI:10.1039/c9ob00061e
日期:——
report a novel rhodium-catalyzed ortho-mono-alkynylation of aryl sulfonamides. The reactions of N-tosylacetamides with triisopropylsilyl (TIPS)-substituted bromoalkyne are catalyzed by a [(Cp*RhCl2)2] complex without cyclization, forming ortho-(1-alkynyl) benzenesulfonamides. While triethylsilyl or trimethylsilyl (TES or TMS)-substituted bromoalkyne was also amenable to the alkynylation, affording six-membered