Ring opening reactions of 1-arenesulfonyl-2-(bromomethyl)aziridines
摘要:
The reactivity of 1-arenesulfonyl-2-(bromomethyl)aziridines with respect to lithium dialkylcyanocuprates and lithium dialkylcuprates (Gilman reagents) has been evaluated for the first time, pointing to the conclusion that these substrates can be applied successfully as synthetic equivalents for the 2-aminopropane dication synthon towards 2-alkylaziridines and alpha-branched N-tosylamides in good yields. (C) 2004 Elsevier Ltd. All rights reserved.
Comparative studies about the hydroamination of unactivatedalkenes and dienes catalyzed by either cationic gold(I) triphenyl phosphite complexes or silver salts were performed using sulfonamides, anilines and carbamates as nucleophiles. Gold-catalyzed reactions generally, need lower loadings than those carried out with silver salts. Simple alkenes react only with sulfonamides and weak aromatic amines
Zirconium-Catalyzed Intermolecular Hydroamination of Unactivated Olefins
作者:Li-Wen Xu、Chun-Gu Xia、Lei Yang、Wei Zhou、Yue-Hua Gao、Wei Sun
DOI:10.1055/s-0028-1088151
日期:2009.4
Highly efficienthydroamination reactions of sulfonamides, carboxamides, and carbamates with unactivatedolefins catalyzed by simple and inexpensive zirconium salts under mild reaction conditions were presented for the practical preparation of various amines. These processes gave good to excellent yields of the addition products in Markovnikov addition fashion.
Mono- vs. Dinuclear Gold-Catalyzed Intermolecular Hydroamidation
作者:Juan M. Serrano-Becerra、Alexander F. G. Maier、Sandra González-Gallardo、Eric Moos、Christoph Kaub、Maximilian Gaffga、Gereon Niedner-Schatteburg、Peter W. Roesky、Frank Breher、Jan Paradies
DOI:10.1002/ejoc.201402068
日期:2014.7
Mono- and dinuclear gold catalysts were investigated in the intermolecularhydroamidation of olefins. Upon activation of [Ph3PAuCl] and [xantphos(AuCl)2] with various silver salts (AgOTf, Ag[BF4], and Ag[SbF6]), diverging reactivity of the resulting cationic gold complexes was observed. It was found that both the binding ability of the counterion and the solvent have a significant impact on the reactivity
Hydroamination and Hydroalkoxylation Catalyzed by Triflic Acid. Parallels to Reactions Initiated with Metal Triflates
作者:Devon C. Rosenfeld、Shashank Shekhar、Akihiro Takemiya、Masaru Utsunomiya、John F. Hartwig
DOI:10.1021/ol061174+
日期:2006.9.1
Intermolecular additions of the O-H bonds of phenols and alcohols and the N-H bonds of sulfonamides and benzamide to olefins catalyzed by 1 mol % of triflic acid and studies to define the relationship between these reactions and those catalyzed by metal triflates are reported. Cyclization of an alcohol containing pendant monosubstituted and trisubstituted olefins catalyzed by either triflic acid or metal triflates form products from addition to the more substituted olefin, and additions of tosylamide catalyzed by triflic acid or metal triflates form indistinguishable ratios of the two N-alkyl sulfonamides.