Comparative studies on the enantioselective fluorination of oxindoles with structurally modified N-fluorobenzenesulfonimides
摘要:
Structurally modified N-fluorobenzenesulfonimides (NFSIs) have been used to study the enantioselective fluorination of oxindoles in the presence of a bis-cinchona alkaloid, (DHQD)(2)PHAL, as the catalyst. We observe that the NFSI analogues bearing two tert-butyl groups at the para-position of the symmetric phenyl rings led to an enhanced enantioselectivity in most cases (up to 96% ee) compared with the unmodified NESIs (less than 69% ee). (C) 2013 Elsevier Ltd. All rights reserved.
A facile, copper-catalyzed aminoarylation reaction of various aryl/alkyl alkynes was realized by utilizing N-fluoroarylsulfonimides (NFSI) as aminoarylation or amination reagent with hydroxyl as directing group. With this methodology, various α,β-unsaturated carbonyl compounds and indenones were efficiently constructed, and the synthetic application for indole derivatives was also provided. The aminoarylation
The investigation of fluorination reaction of p-substituted benzenesulfonimides with fluorine–nitrogen mixed gas to synthesize NFSI analogues
作者:Guanlong Chen、Fuli Chen、Yan Zhang、Xueyan Yang、Xiaoming Yuan、Fanhong Wu、Xianjin Yang
DOI:10.1016/j.jfluchem.2011.10.012
日期:2012.1
This paper studied the fluorination reaction of p-substituted benzenesulfonimides with diluted elemental fluorine to synthesize N-fluoro-benzenesulfonimide (NFSI) analogues. Several synthetic methods were compared and we found that, for many p-substituted benzenesulfonimides, the fluorination of their sodium salts with 10% F-2-N-2 mixed gas in acetonitrile at room temperature could afford NFSI analogues in moderate to good yields. (C) 2011 Elsevier B.V. All rights reserved.