A novel synthesis of α-azidocinnamates, α-azido-α,β-unsaturated ketones and β-azidostyrenes mediated by cerium(IV) ammonium nitrate
作者:Vijay Nair、Tesmol G George
DOI:10.1016/s0040-4039(00)00350-6
日期:2000.4
Cerium(IV) ammonium nitrate mediated addition of azide to cinnamic esters, acids and α,β-unsaturatedketones, followed by reaction with sodium acetate afforded the α-azidocinnamates, β-azidostyrenes and α-azido-α,β-unsaturatedketones, respectively, in good yields.
designed and synthesized. Among these compounds, compound 25 could significantly inhibit RSL3-induced ferroptosis with an EC50 value of 8.6 ± 2.2 nM in HT-1080 cells, which was 3-fold more potent than the classical ferroptosis inhibitor ferrostatin-1 (Fer-1) (EC50 = 23.4 ± 1.3 nM). The potent ferroptosis inhibitory activity of compound 25 was further validated in multiple additional cell lines. Our mechanistic
thoroughly investigated using electrochemistry and different steady-state and time-resolved spectroscopic techniques. Photoluminescence lifetime measurements and femtosecond transient absorption studies revealed the formation of a long-lived excited state in 2 after photoexcitation. Thus, the enhanced catalytic performance through the induction of ferrocene is rationalized based on transiently shelving
The cyclization of 1,3-diaryl-2-azido-2-propen-1-ones with various alkynes in the presence of a catalytic amount of copper sulfate-sodium ascorbate in DMSO-water mixture under microwave irradiation led to the formation of (Z)-1,3-diaryl-2-(4-substituted-1H-1,2,3-triazol-1-yl)prop-2-en-1-ones. The structure and stereochemistry of the products have been elucidated by spectroscopic and single crystal X-ray analyses. All the newly synthesized compounds have been tested for their antibacterial activity against four strains of bacteria and found to have moderate to good inhibition.
Unexpected Synthesis of 2,4,5-Trisubstituted Oxazoles via a Tandem Aza-Wittig/Michael/Isomerization Reaction of Vinyliminophosphorane
作者:Hai Xie、Ding Yuan、Ming-Wu Ding
DOI:10.1021/jo202588j
日期:2012.3.16
2 4,5-Trisubstituted oxazoles 6 were unexpectedly prepared from a tandem reaction of vinyliminophosphorane 3 with various acyl chlorides in a one-pot fashion.