Synthesis of Benzofused Five-Ring Sultams via Rh-Catalyzed C–H Olefination Directed by an N-Ac-Substituted Sulfonamide Group
摘要:
A Rh-catalyzed N-Ac-sulfonamide group directed C-H olefination-cyclization to afford benzofused five-ring sultam is described with high yield and a wide range of substrate scope. The N-acetyl group is a key for this transformation implying that N-H acidity is the major influence. The acetyl group is removed under mild conditions in excellent yield to provide NH-free sultam that can be transformed into various benzofused five-ring sultam analogues via acylation, nucleophilic substitution, and Mitsunobu alkylation.
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.
Synthesis of Succinimide Spiro-Fused Sultams from the Reaction of <i>N</i>-(Phenylsulfonyl)acetamides with Maleimides via C(sp<sup>2</sup>)–H Activation
作者:Bing Hu、Guang Chen、Jie Zhao、Lian Xue、Yuqin Jiang、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.joc.1c01048
日期:2021.8.6
spiro-fused sultams through the coupling reaction of N-(phenylsulfonyl)acetamides with maleimides. It is deduced that this reaction should proceed through a cascade process including Rh(III)-catalyzed C(sp2)–H bond cleavage of N-(phenylsulfonyl)acetamide, maleimide double bond insertion into the C–Rh bond, β-hydride elimination, reductiveelimination, and intramolecular aza-Michael addition. Notably, this
RhCl<sub>3</sub>-Catalyzed Oxidative C–H/C–H Cross-Coupling of (Hetero)aromatic Sulfonamides with (Hetero)arenes
作者:You Ran、Yudong Yang、Huansha You、Jingsong You
DOI:10.1021/acscatal.7b04298
日期:2018.3.2
1,1′-Bi(hetero)aryl 2-sulfonamide scaffolds have been widely used as a privileged structure in drug discovery. Herein, we report an efficient rhodium-catalyzed oxidative C–H/C–H cross-coupling between a (hetero)aromatic sulfonamide and a (hetero)arene to afford ortho-sulfonamido bi(hetero)aryls. This methodology features broad substrate scope, good functional group tolerance, and relatively inexpensive
Ruthenium-Catalyzed Selectively Oxidative C–H Alkenylation of <i>N</i>-Acylated Aryl Sulfonamides by Using Molecular Oxygen as an Oxidant
作者:Xueyuan Li、Xiao Hu、Zijie Liu、Jingshu Yang、Bo Mei、Yi Dong、Gang Liu
DOI:10.1021/acs.joc.0c00242
日期:2020.5.1
A ruthenium-catalyzed sulfonamide-directed ortho aryl C-H alkenylation/annulation to afford five-membered sultam by using of molecular oxygen as an oxidant is reported in this article. Compared to the previous transition-metal-catalyzed C-H alkenylation of aryl sulfonamides, no excess metal salt oxidant was required in this method. A wide sulfonamide substrates scope and good regioselectivity and site-selectivity
In this Letter, triazoles as carbene reagents were used for sulfonamide-directed C-H insertion carbenoid functionalization to construct benzylpyridine sulfonamide dual-pharmacophore compounds. This method is simple and efficient and can be used for the late-stage modification of sulfonamide drugs.