A new method based on nitration/cyclization of 1,6-enynes
A cyclization reaction and compound technology, applied in chemical instruments and methods, organic radical generation, organic chemistry, etc., can solve the problems of low reaction atom economy, uncontrollable reaction system, low regioselectivity, etc., and achieve good Application prospect, low cost, and the effect of improving reaction efficiency
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Embodiment 1
[0028]
[0029] Add 1,6-enyne compound (39.8mg, 0.2mmol) shown in formula 1a, copper nitrate (74.8mg, 0.4mmol) shown in formula 2a, potassium persulfate (K 2 S2 o 8 , 64.8mg, 0.24mmol) and N,N-dimethylformamide (2mL), then the reactor was stirred and reacted in an air atmosphere at 80°C, and the reaction progress was monitored by TLC until the raw materials disappeared (the reaction time was 4 hours ), after the reaction was completed, the reaction solution was extracted with ethyl acetate into the organic phase, then the obtained organic phase was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to remove the solvent, the residue was separated by column chromatography, column chromatography The elution solvent in is: ethyl acetate / n-hexane to obtain the target product I-1 (90% yield); 1 H NMR (500MHz, CDCl 3 )δ: 7.68(d, J=8.0Hz, 2H), 7.40(t, J=8.0Hz, 2H), 7.20(t, J=7.5Hz, 1H), 5.30(t, J=2.0Hz, 1H) ,5.20(t,J=3.5Hz,1H),4.97(d,J=14.0Hz,...
Embodiment 2
[0031] No oxidizing agent potassium persulfate was added, other conditions were the same as in Example 1, and the yield of the target product I-1 was 0%.
Embodiment 3
[0033] Iodobenzene acetate (PhI(OAc) 2 , 77.3mg, 0.24mmol) instead of potassium persulfate, all the other conditions were the same as in Example 1, and the yield of the target product I-1 was 21%.
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