A kind of preparation method of 3- benzofuranones
Technical field
The invention belongs to technical field of organic synthesis, and in particular to a kind of preparation side of 3- benzofuranones
Method.
Background technology
3- benzofuran ketone compounds have good physiological activity, this heterocyclic compounds and its derivative can conducts
Antioxidant (J.Agric.Food Chem.2006,54,3551.), anti-Type B influenza virus (Eur.J.Med.Chem.2013,
62,534.), the potent antibiotics (Chem.Eur.J.2012,18,16123.) and antibacterials of gram positive pathogens
(Bioorg.Med.Chem.Lett.2012,22,6292.), in view of 3- benzofuran ketone compounds extensive bioactivity and answer
With value, a kind of synthesize 3- benzofuranones new method with developing practicability and effectiveness is of great significance.
The preparation method of 3- benzofuranones has:
1) using Chloro-O-Phenyl diketone and phenyl boric acid as raw material
Seminar of Xu Ming China has developed a kind of using Chloro-O-Phenyl diketone and phenyl boric acid as raw material, [Rh (COE)2Cl]2、Pd
(OAc)2Make catalyst, K3PO4Make alkali, toluene makees solvent, prepare 3- benzofuranone derivatives (Org.Lett.2017,19,
2726)。
2) using 3- hydroxyls chromone and alkynes as raw material
Sanjib Gogoi seminars are using 3- hydroxyls chromone and alkynes as raw material, [RuCl2(p-cymene)2] make catalyst,
PPh3 makees ligand, tert-pentyl alcohol makees solvent, preparation 3- benzofuranone derivatives (Angew.Chem.Int.Ed.2018,57,
456)。
3) using beta naphthal and acetophenone as raw material
Wu Anxin seminars are using beta naphthal and acetophenone as raw material, and iodine makees catalyst, DMSO makees solvent, 100 degrees Celsius
Under the conditions of reacted, prepare 3- benzofuranone derivatives (Org.Lett.2014,16,1732).
3- benzofuranones are synthesized using the above method, are had certain disadvantages and insufficient:1) nitrogen is needed
Protection;2) cumbersome;3) reaction time is long.
Invention content
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of preparations of 3- benzofuranones
Method.
1. a kind of preparation method of 3- benzofuranones, the 3- benzofuranones have Formulas I
Shown in structure:
In Formulas I, wherein R1Selected from hydrogen, 5- methyl, 6- methyl, 7- methyl, 5- fluorine, 5- chlorine, 5- trifluoromethyls;R2Selected from second
Amide groups, n-valeramide base;R3Selected from phenyl, to tert-butyl-phenyl, p-methoxyphenyl;;It is characterized in that, into reactor
It is 1 that molar ratio, which is added,:5% rhodium catalyst, cobalt acetate hydrate, the hydration of pivalic acid sodium is added in 1 phenol derivatives and propiolic acid
Object is added the solvent of one of methanol, 1,2- dichloroethanes, tertriary amylo alcohol, hexafluoroisopropanol, is stirred to react at room temperature, reactional equation
Formula is as follows:
Beneficial effects of the present invention are:The synthetic method science of 3- benzofuranones provided by the invention is closed
Reason provides a kind of new way of a variety of substituent group 3- benzofuranones of synthesis;But also it is easy to get, grasps with raw material
Make the features such as simple, reaction condition is mild, the reaction time is short.
Description of the drawings
Fig. 1 is the NMR spectra of compound 3a prepared by embodiment 1;
Fig. 2 is the NMR spectra of compound 3d prepared by embodiment 4;
Fig. 3 is the NMR spectra of compound 3e prepared by embodiment 5.
Specific implementation mode
The present invention is described in more detail with specific embodiment below in conjunction with the accompanying drawings:
Experimental method described in following embodiments is unless otherwise specified conventional method;The reagent and material, such as
Without specified otherwise, commercially obtain.
Embodiment 1
The preparation of 3- benzofuranones 3a
By N- phenoxy-acetamides (0.2mmol, 30mg), phenylpropiolic acid (0.2mmol, 29mg), 5% rhodium catalyst, vinegar
Sour cobalt hydrate, pivalic acid sodium hydrate, methanol 1.0mL are added in 15mL heavy wall pressure pipes, and open stirring 12 at room temperature is small
When.After completion of the reaction, N- (3- oxos-are obtained through column chromatography for separation (200-300 mesh silica gel) (petrol ether/ethyl acetate=4/1)
2- phenyl -2,3- Dihydrobenzofuranes -2- bases) acetamide 3a (0.184mmol, 49mg), detach yield 92%.
Spectrum elucidation data 3a:
1H NMR(500MHz,CDCl3):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=7.35Hz, 1H), 6.56 (s, 1H), 1.95 (s, 1H)13C NMR
(125MHz,CDCl3):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 C16H13NO3Na,290.0793,
found 290.0796.
Embodiment 2
The 1a in example 1 is replaced with 1b, for other conditions with example 1, experimental result is shown in Table 1.
Spectrum elucidation data 3b:
1H NMR(500MHz,CDCl3):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).13C NMR(125MHz,CDCl3):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 C17H15NO3Na,304.0950,found 304.0951.
Embodiment 3
The 1a in example 1 is replaced with 1c, for other conditions with example 1, experimental result is shown in Table 1.
Spectrum elucidation data 3c:
1H NMR(500MHz,CDCl3):δ 7.71-7.69 (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)13C NMR
(125MHz,CDCl3):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 C17H15NO3Na,
304.0950,found 304.0952.
Embodiment 4
The 1a in example 1 is replaced with 1d, for other conditions with example 1, experimental result is shown in Table 1.
Spectrum elucidation data 3d:
1H NMR(500MHz,CDCl3):δ 7.71-7.70 (m, 2H), 7.47 (d, J=7.5Hz, 1H), 7.43 (d, J=
7.3Hz, 1H), 7.39-7.38 (m, 3H), 6.98 (t, J=7.4Hz, 1H), 6.46 (s, 1H), 2.43 (s, 3H), 2.03 (s,
3H).13C NMR(125MHz,CDCl3):δ195.1,169.7,168.1,138.4,134.7,129.7,128.9,125.5,
122.3,122.2,122.1,119.2,91.4,22.5,24.4.HRMS(ESI-TOF,[M+H]+):calcd for
C17H16NO3Na,282.1130,found 282.1133.
Embodiment 5
The 1a in example 1 is replaced with 1e, for other conditions with example 1, experimental result is shown in Table 1.
Spectrum elucidation data 3e:
1H NMR(500MHz,CDCl3):δ7.70-7.68(m,2H),7.44-7.39(m,1H),7.41-7.39(m,3H),
7.34 (td, J=8.8,2.8Hz, 1H), 7.29 (dd, J=6.6,2.7Hz, 1H), 7.14 (dd, J=8.9,3.6Hz, 1H),
6.52(s,1H),2.02(s,3H).13C NMR(125MHz,CDCl3):δ194.2,169.9,165.4,157.9(1JC-F=
242.8Hz),134.0,129.9,129.1,125.6,125.1(2JC-F=25.8Hz), 120.4 (3JC-F=7.2Hz), 113.4
(3JC-F=7.0Hz), 110.4 (2JC-F=24.0Hz), 92.5,22.3.HRMS (ESI-TOF, [M+Na]+):calcd for
C16H12NO3FNa,308.0699,found308.0697.
Embodiment 6
The 1a in example 1 is replaced with 1f, for other conditions with example 1, experimental result is shown in Table 1.
Spectrum elucidation data 3f:
1H NMR(500MHz,CDCl3):δ7.66(brs,2H),7.57-7.55(m,2H),7.39(brs,3H),7.13
(d, J=8.3,1H), 6.64 (s, 1H), 1.96 (s, 3H)13C NMR(125MHz,CDCl3):δ193.5,169.9,167.6,
137.4,133.6,129.9,129.1,127.7,125.5,124.6,121.0,113.6,92.3,22.3.HRMS(ESI-TOF,
[M+Na]+):calcd for C16H12NO3ClNa,324.0403,found 324.0407.
Embodiment 7
The 2a in example 1 is replaced with 2b, for other conditions with example 1, experimental result is shown in Table 1.
Spectrum elucidation data 3g:
1H NMR(500MHz,CDCl3):δ 7.63-7.59 (m, 4H), 7.40 (d, J=8.3Hz, 2H), 7.16 (d, J=
8.3Hz, 1H), 7.06 (t, J=7.4Hz, 1H), 6.60 (s, 1H), 1.94 (s, 3H), 1.28 (s, 9H)13C NMR(125MHz,
CDCl3):δ194.9,169.8,169.5,152.9,137.7,131.4,125.9,125.3,125.1,122.2,119.9,
112.3,91.5,34.6,31.1,26.9,22.3.HRMS(ESI-TOF,[M+Na]+):calcd for C20H21NO3Na,
346.1419,found 346.1419.
Embodiment 8
The 1a in example 1 is replaced with 1h, for other conditions with example 1, experimental result is shown in Table 1.
Spectrum elucidation data 3h:
1H NMR(500MHz,CDCl3):δ 7.91 (s, 1H), 7.85 (d, J=8.6Hz, 2H), 7.68-7.67 (m, 3H),
7.40-7.39(m,3H),7.25(s,1H),6.58(s,1H),2.01(s,3H).13C NMR(125MHz,CDCl3):δ193.2,
170.8,170.0,134.4,133.5,130.0,129.1,125.5,125.0(q,2JC-F=33.6Hz), 123.6 (q,1JC-F=
271.9Hz),122.9,120.2,112,9,92.6,22.2.HRMS(ESI-TOF,[M+Na]+):calcd for
C17H12F3NO3Na,358.0667,found 358.0665.
Embodiment 9
The 1a in example 1 is replaced with 1i, for other conditions with example 1, experimental result is shown in Table 1.
Spectrum elucidation data 3i:
1H NMR(500MHz,CDCl3):δ7.70-7.69(m,2H),7.63-7.59(m,2H),7.38-7.37(m,3H),
7.17 (d, J=8.2Hz, 1H), 7.07 (t, J=7.4Hz, 1H), 6.53 (s, 1H), 2.27-2.15 (m, 2H), 1.60-1.53
(m, 2H), 1.37-1.30 (m, 2H), 0.89 (t, J=7.3Hz, 3H)13C NMR(125MHz,CDCl3):δ194.7,173.0,
169.4,137.7,134.6,129.6,128.9,125.6,125.1,122.3,119.9,112.3,91.6,35.1,26.9,
22.1,13.7.HRMS(ESI-TOF,[M+Na]+):calcd for C19H19NO3Na,332.1263,found 332.1266.
Embodiment 10
The 2a in example 1 is replaced with 2c, for other conditions with example 1, experimental result is shown in Table 1.
Spectrum elucidation data 3j:
1H NMR(500MHz,CDCl3):δ 7.64-7.59 (m, 4H), 7.15 (d, J=8.3Hz, 1H), 7.07 (t, J=
7.4Hz, 1H), 6.89 (d, J=8.7Hz, 2H), 6.50 (s, 1H), 3.78 (s, 3H), 1.99 (s, 3H)13C NMR(125MHz,
CDCl3):δ194.9,169.9,169.3,160.7,137.7,127.0,126.2,125.1,122.2,119.9,114.3,
112.2,91.4,55.3,22.3.HRMS(ESI-TOF,[M+Na]+):calcd for C17H15NO4Na,320.0899,found
320.0899.
Table 1