The highly chemoselective transfer hydrogenation of the carbon–carbon double bond of conjugated nitroalkenes by a rhodium complex
作者:Jing Xiang、Er-Xiao Sun、Chun-Xia Lian、Wei-Cheng Yuan、Jin Zhu、Qiwei Wang、Jingen Deng
DOI:10.1016/j.tet.2012.04.028
日期:2012.6
Chemoselective transfer hydrogenation of conjugatednitroalkenes catalyzed by [RhCl2Cp∗]2–diamine complex (Cp∗=η5-C5Me5) using HCOOH/Et3N (5:2) (TEAF) as a hydrogen source was realized. A variety of nitrostyrenes, β-methyl nitrostyrenes, and 3-methyl-4-nitro-5-alkenyl-isoxazoles were reduced smoothly in good to excellent yields in short reaction time. Other functional groups are inert under the reaction
to be good CC electrophilic acceptors for the construction of various azaarene-containing Michael addition products. This method provides an efficient and environmentally benign method for the one-potsynthesis of biologically important azaarene-substituted isoxazole derivatives in good yields. The important aspects of the present methodology are the use of non-toxic solvent, that it is catalyst free
A three component one-pot protocol has been investigated for the synthesis of arylmethylene bis-isoxazolo[4,5-b]pyridine-N-oxides 1 from the commercially available materials. The title compounds 1 were also synthesized by a step-wise method and found to be identical with one-pot synthesis by spectral and analytical data. The newly synthesized compounds were evaluated for their in vitro anticancer activity against human cancer cell lines and in vivo anticancer activity on EAC-bearing mice. Compound 1a was found to be the most active both in in vitro and in vivo cytotoxic studies. (C) 2012 Elsevier Masson SAS. All rights reserved.