Exploring New Uses for C−H Amination: Ni-Catalyzed Cross-Coupling of Cyclic Sulfamates
摘要:
Benzene-fused cyclic sulfamates are prepared from ortho-substituted phenolic starting materials through selective C-H amination or olefin aziridination. These unique heterocycles will engage in Ni-catalyzed cross-coupling reactions with aryl- and alkyl-Grignard reagents. Application of modern tools for C-N and C-C bond formation thus makes readily available functional amine derivatives and augments the possible uses for C-H amination in synthesis.
Asymmetric transfer of nitrenes catalyzed by chiral dirhodium(II) using aromatic sulfamate esters
作者:Corinne Fruit、Paul Müller
DOI:10.1016/j.tetasy.2004.01.015
日期:2004.3
insertions of aromatic sulfamate esters into activated C–H bonds have been achieved via in situ generated phenyliodinanes in the presence of PhI(OAc)2, MgO, and chiral Rh(II) catalysts. The optimal results were obtained with [Rh2(S)-nttl}4] and [Rh2(R)-ntv}4] as catalysts with up to 52% ee. In contrast, phenylsulfamates with allylic ortho-substituents reacted via intramolecular aziridination rather
Synthesis and Structure of Hypervalent Diacetoxybromobenzene and Aziridination of Olefins with Imino-λ<sup>3</sup>-bromane Generated in Situ under Metal-Free Conditions
Ligand exchange of p-CF3C6H4BrF2 with acetoxy groups using AcOH and Ac2O affords (diacetoxybromo)benzene in a high yield, which undergoes azirldination of alkenes In the presence of TfNH2 and sulfamate esters in one pot under mild conditions. The azirldination with TfNH2 proceeds stereospecifically with retention of stereochemistry of olefins at room temperature using limiting amounts of olefins under transition-metal-free conditions. The one-pot aziridination procedure using sulfamate esters can be applied to the Intramolecular versions.
JPS6233159A
申请人:——
公开号:JPS6233159A
公开(公告)日:1987-02-13
Exploring New Uses for C−H Amination: Ni-Catalyzed Cross-Coupling of Cyclic Sulfamates
作者:Paul M. Wehn、J. Du Bois
DOI:10.1021/ol051896l
日期:2005.10.1
Benzene-fused cyclic sulfamates are prepared from ortho-substituted phenolic starting materials through selective C-H amination or olefin aziridination. These unique heterocycles will engage in Ni-catalyzed cross-coupling reactions with aryl- and alkyl-Grignard reagents. Application of modern tools for C-N and C-C bond formation thus makes readily available functional amine derivatives and augments the possible uses for C-H amination in synthesis.
Design and synthesis of cyclic sulfonamides and sulfamates as new calcium sensing receptor agonists
作者:Lionel Kiefer、Tatiana Gorojankina、Philippe Dauban、Hélène Faure、Martial Ruat、Robert H. Dodd
DOI:10.1016/j.bmcl.2010.10.006
日期:2010.12
The design, synthesis and calcimimetic properties of various cyclic sulfonamides and sulfamates are described. The latter were prepared from the corresponding o-alkenylarenesulfonamides via copper-or rhodium-catalyzed intramolecular aziridination. The size of the cyclic sulfonamide rings as well as the position of the crucial (R)-naphthylethylamine substituent significantly affected calcimimetic activity. The most active compounds were the six-and seven-membered sulfonamides 30a and 31a and sulfamate 34a. (C) 2010 Elsevier Ltd. All rights reserved.