Preparation method of 2-benzofuranone compound
A technology of benzofuranone and compounds, which is applied in the field of preparation of 3-benzofuranone compounds, can solve the problems of cumbersome operation and long reaction time, and achieve the effects of simple operation, short reaction time and mild reaction conditions
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Embodiment 1
[0023] Preparation of 3-benzofuranone compound 3a
[0024]
[0025] Add N-phenoxyacetamide (0.2mmol, 30mg), phenylpropionic acid (0.2mmol, 29mg), 5% rhodium catalyst, cobalt acetate hydrate, sodium pivaloate hydrate, methanol 1.0mL to 15mL thick In the wall pressure tube, stir for 12 hours at room temperature with an open opening. After the reaction, it was separated by column chromatography (200-300 mesh silica gel) (petroleum ether / ethyl acetate=4 / 1) to obtain N-(3-oxo-2-phenyl-2,3-dihydrobenzo Furan-2-yl)acetamide 3a (0.184mmol, 49mg), isolated yield 92%.
[0026] Spectral analysis data 3a:
[0027] 1 H NMR(500MHz, CDCl 3 ):δ7.69-7.68(m,2H),7.63-7.59(m,2H),7.37-7.36(m,2H),7.16(d,J=8.15Hz,1H), 7.07(t,J=7.35 Hz, 1H), 6.56 (s, 1H), 1.95 (s, 1H). 13 C NMR(125MHz, CDCl 3 ): δ194.7,170.0,169.4,137.8,134.4,129.7,128.9,125.6,125.1,122.3,119.8,112.2,91.5,22.3.HRMS(ESI-TOF,[M+Na] + ):calcd for C 16 H 13 NO 3 Na, 290.0793, found 290.0796.
Embodiment 2
[0029] Use 1b to replace 1a in Example 1, and other conditions are the same as Example 1. The experimental results are shown in Table 1.
[0030]
[0031] Spectral analysis data 3b:
[0032] 1 H NMR(500MHz, CDCl 3 ): δ7.70(brs,2H),7.44-7.38(m,5H), 7.08-7.07(m,2H), 6.96(brs,1H), 6.50(s,1H), 2.32(s,3H), 2.00(s,3H). 13 C NMR(125MHz, CDCl 3 ):δ194.9,169.8,167.8,138.9,134.6,132.0,129.6,128.9,125.6,124.6,119.6,111.9,91.7,22.4,20.6.HRMS(ESI-TOF,[M+Na] + ):calcd for C 17 H 15 NO 3 Na,304.0950,found 304.0951.
Embodiment 3
[0034] Replace 1a in Example 1 with 1c, and other conditions are the same as Example 1. The experimental results are shown in Table 1.
[0035]
[0036] Spectral analysis data 3c:
[0037] 1 H NMR(500MHz, CDCl 3 ): δ7.71-7.69(m,2H), 7.52(d,J=7.8Hz,1H), 7.38-7.37(m,3H), 6.98(s,1H), 6.90(d,J=7.8Hz, 1H), 6.51(s, 1H), 2.43(s, 3H), 1.99(s, 3H). 13 C NMR(125MHz, CDCl 3 ):δ194.1,169.9,169.8,149.8,134.8,129.6,128.9,125.5,124.8,123.8,117.4,112.4,91.8,22.5,22.4.HRMS(ESI-TOF,[M+Na] + ):calcd for C 17 H 15 NO 3 Na,304.0950,found 304.0952.
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