Brønsted acid-assisted N-alkylation of sulfonamides using ethers as the alkylation reagents
摘要:
N-Alkylation of sulfonamides using cyclic ethers as alkylation reagents and Bronsted acid as a catalyst produced pyrrolidine and piperidine derivatives in good yields. When using symmetrical and unsymmetrical ethers as alkylation reagents, mono-N-allcylation of sulfonamides took place to afford the corresponding products. (C) 2013 Elsevier Ltd. All rights reserved.
Tungsten(0) alkylidene complexes stabilized as pyridinium ylides: new aspects of their synthesis and reactivity
作者:Henri Rudler、Thomas Durand-Réville
DOI:10.1016/s0022-328x(00)00727-0
日期:2001.1
The interaction of dihydropyridines with alkoxycarbene complexes of tungsten has been shown to lead to pyridinium ylid complexes: this transformation has now been applied to the synthesis of a hydroxyl-containing ylid complex by ring-opening of the pentacarbonyl (2-oxacyclopentylidene) tungsten(0) complex and to the synthesis of a series of chiral ylid complexes both from chiral and non-chiral carbene
Iron-Catalyzed Tandem Cyclization and Cross-Coupling Reactions of Iodoalkanes and Aryl Grignard Reagents
作者:Jae Gon Kim、Young Hoon Son、Jin Won Seo、Eun Joo Kang
DOI:10.1002/ejoc.201403511
日期:2015.3
Several experimental results, such as cyclopropyl ring opening, the stereochemical outcome of the reaction with a secondary iodide substrate, and intermediate identification with 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO), support the conclusion that a radical process is involved in this catalytic system. Moreover, deuterium labeling experiments indicated that radical disproportionation could occur in
A RADICAL DEOXYGENATION OF PRIMARY ALCOHOLS BY USE OF TRI-<i>n</i>-BUTYLTIN HYDRIDE-SODIUM IODIDE, AND ITS APPLICATION TO A RADICAL CYCLIZATION
作者:Yoshio Ueno、Chie Tanaka、Makoto Okawara
DOI:10.1246/cl.1983.795
日期:1983.5.5
Primary alcohols are deoxygenated to hydrocarbons viatosylates with tri-n-butyltin hydride-sodium iodide under mild radical conditions; the method is useful for the preparation of cyclic compounds from acyclic ones possessing primary hydroxyl and olefinic groups by reductive cyclization.
1,3,2‐Diazaphospholene‐Catalyzed Reductive Cyclizations of Organohalides**
作者:Johannes Klett、Łukasz Woźniak、Nicolai Cramer
DOI:10.1002/anie.202202306
日期:2022.7.25
1,3,2-diazaphospholenes hydrides (DAP-H) are shown as efficient catalysts for reductive radical cyclization of aryl and alkyl halides under irradiation with visible light. The pivotal DAP catalyst turnover was achieved by a DBU-assisted σ-bondmetathesis between the formed DAP halide and HBpin.