Selectfluor-Mediated Fluorination and C-C Bond Cleavage of Cyclohexene-Fused Isoxazoline<i>N</i>-Oxides
作者:Rajawinslin R.R.、Mustafa J. Raihan、Donala Janreddy、Veerababurao Kavala、Chun-Wei Kuo、Ting-Shen Kuo、Mei-Ling Chen、Chiu-Hui He、Ching-Fa Yao
DOI:10.1002/ejoc.201300599
日期:2013.9
A rapid method for the synthesis of long-chain fluorinated compounds using a C–Cbond-cleavage reaction was developed. Selectfluor was the most effective fluorinating agent of those tested in this study. Long-chain fluoro dioxo nitriles were formed from isoxazoline N-oxides via nitroso intermediates.
Halonium Ion Mediated Synthesis of 2-Halomethylene-3-oxoketoxime Derivatives from Isoxazoline <i>N</i>-Oxides
作者:Mustafa J. Raihan、R. R. Rajawinslin、Veerababurao Kavala、Chun-Wei Kuo、Ting-Shen Kuo、Chiu-Hui He、Hsiu-Ni Huang、Ching-Fa Yao
DOI:10.1021/jo401283x
日期:2013.9.6
trichloroisocyanuric acid (TCCA)-mediated synthesis of novel 2-halomethylene-3-oxoketoximes via one-pot halogenation/oxidation of isoxazolineN-oxide derivatives is described here. The keto functionality of 3-ketoximes was selectively reduced by lithiumaluminum hydride to synthesize an unprecedented type of Baylis–Hillman oxime, which underwent N–O coupling to produce new isoxazolineN-oxide derivative.
Selectfluor mediated one pot synthesis of cyclohexanone ring fused isoxazole derivatives
作者:R.R. Rajawinslin、Mustafa J. Raihan、Donala Janreddy、Veerababurao Kavala、Chun-Wei Kuo、Ting-Shen Kuo、Mei-Ling Chen、Chiu-Hui He、Ching-Fa Yao
DOI:10.1016/j.tet.2014.08.024
日期:2014.10
A Selectfluor and base mediated protocol for the synthesis of cyclohexanone ring fused isoxazolederivatives from isoxazoline N-oxides has been successfully developed. This rapid, one-pot, two-step transformation is achieved in acetonitrile, through nitroso intermediate followed by hydration, defluorination and N–O coupling in the presence of triethylamine. The scope and mechanism of the protocol have