Copper-catalyzed cascade aminoalkynylation–oxidation of propargylic alcohols has been realized, sterospecifically providing an array of (Z)-2-amino conjugated enynals/enynones in good yields under mild conditions. This transformation involves a rare 1,3-alkynyl migration of propargylic alcohols and simultaneously forms C–C, C–N, and C═O bonds. Furthermore, (Z)-2-amino conjugated enynals were applied
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.
Comparative studies on the enantioselective fluorination of oxindoles with structurally modified N-fluorobenzenesulfonimides
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.