Plan
Comptes Rendus
no. 2

Preparation of 3,4,5-substituted furan-2(5H)-ones using aluminum hydrogen sulfate as an efficient catalyst
Mohammad Reza Mohammad Shafiee1  ; Syed Sheik Mansoor2  ; Majid Ghashang1  ; Abbas Fazlinia3
1 Department of Chemistry, Faculty of Sciences, Najafabad Branch, Islamic Azad University, P.O. Box: 517, Najafabad, Esfahan, Iran
2 Research Department of Chemistry, Bioactive Organic Molecule Synthetic Unit, C. Abdul Hakeem College, Melvisharam, 632 509 Tamil Nadu, India
3 Department of Chemistry, Neyriz Branch, Islamic Azad University, Neyriz, Iran
Comptes Rendus. Chimie, Volume 17 (2014) no. 2, pp. 131-134.

Résumé

Various derivatives of 3,4,5-substituted furan-2(5H)-ones have been readily prepared by using aluminum hydrogen sulfate [Al(HSO4)3] as an efficient catalyst in good yields and milder reaction conditions. The versatility of this protocol has been demonstrated with various substituted furan-2(5H)-ones.

Métadonnées
Reçu le :
Accepté le :
Publié le :
DOI : 10.1016/j.crci.2013.06.009
Mots clés : 3, 4, 5-substituted furan-2(5H)-one, Al(HSO4)3, Acetylenic esters, Butenolides
Mohammad Reza Mohammad Shafiee 1 ; Syed Sheik Mansoor 2 ; Majid Ghashang 1 ; Abbas Fazlinia 3

1 Department of Chemistry, Faculty of Sciences, Najafabad Branch, Islamic Azad University, P.O. Box: 517, Najafabad, Esfahan, Iran
2 Research Department of Chemistry, Bioactive Organic Molecule Synthetic Unit, C. Abdul Hakeem College, Melvisharam, 632 509 Tamil Nadu, India
3 Department of Chemistry, Neyriz Branch, Islamic Azad University, Neyriz, Iran 
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     author = {Mohammad Reza Mohammad Shafiee and Syed Sheik Mansoor and Majid Ghashang and Abbas Fazlinia},
     title = {Preparation of 3,4,5-substituted {furan-2(5H)-ones} using aluminum hydrogen sulfate as an efficient catalyst},
     journal = {Comptes Rendus. Chimie},
     pages = {131--134},
     publisher = {Elsevier},
     volume = {17},
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     year = {2014},
     doi = {10.1016/j.crci.2013.06.009},
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%A Syed Sheik Mansoor
%A Majid Ghashang
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Mohammad Reza Mohammad Shafiee; Syed Sheik Mansoor; Majid Ghashang; Abbas Fazlinia. Preparation of 3,4,5-substituted furan-2(5H)-ones using aluminum hydrogen sulfate as an efficient catalyst. Comptes Rendus. Chimie, Volume 17 (2014) no. 2, pp. 131-134. doi : 10.1016/j.crci.2013.06.009. https://comptes-rendus.academie-sciences.fr/chimie/articles/10.1016/j.crci.2013.06.009/

Version originale du texte intégral

1 Introduction

Multi-component reactions (MCRs) have gained much attention due to their ability in facile execution and productivity [1]. MCRs based on the use of acetylenic esters as starting material has gained much importance in organic synthesis, partly because of the diverse types of clinical and pharmacological activity associated with the products of this reaction [2–6]. Of all kinds of MCRs based on the use of acetylenic esters, methods to synthesize furan derivatives were considered as the most versatile ones for chemical construction of poly-substituted furans [7–11].

Substituted furan derivatives are fundamentally important heterocyclic molecules and are present in many natural and medicinal structures [12,13]. They can be used as valuable intermediates for the construction of heterocycles in organic synthesis. Thus, efforts for the synthesis of furan scaffolds are in demand by organic chemists. Among the various furan derivatives, butenolides have appeared in the literature as interesting components for the construction of natural and pharmacological compounds. These skeletons show a wide range of biological activities such as antimicrobial [14], antifungal [15], anti-inflammatory [16], anticancer [17] and anti-viral HIV-1 [18] activities. Due to this wide range of abundance and applicability, various approaches toward substituted butenolides have been developed, which involve the use of organo-lithium [19], boronic acids [20,21], transition-metal catalysts such as Pd(OAc)2 [22], Ru [23], Cu(II) [24], AuCl [25], and secondary amines [26]. However, many of these methods involve the use of expensive catalysts and hazardous reagents in stoichiometric amounts.

A new route to the synthesis of furan skeletons was developed by Murthy et al. via the multi-component reaction of aromatic amines, aldehydes and acetylenic esters, which lead to the preparation of 3,4,5-substituted furan-2(5H)-one derivatives using β-cyclodextrin as a catalyst in water [27]. Recently, Nagarapu et al. reported that SnCl2 can efficiently catalyze this reaction [28].

However, as the existing literature reports that the reaction performance is somewhat vitiated by its time-consuming aspects, the development of a new, efficient and green approach for the preparation of substituted furan-2(5H)-ones is highly desirable. In view of the above and as a part of our ongoing program on multi-component reactions [29], an efficient and convenient synthesis of 3,4,5-substituted furan-2(5H)-one derivatives has been accomplished by a multi-component reaction between aromatic amines, aldehydes and acetylenic esters, using Al(HSO4)3 as an efficient catalyst, with good yields (Scheme 1).

Scheme 1

Preparation of 3,4,5-substituted furan-2(5H)-one derivatives.

2 Experimental

2.1 Reagents and instrumentation

All reagents were purchased from Merck and Aldrich and used without further purification. All yields refer to isolated products after purification. The NMR spectra were recorded on a Bruker Avance DPX 400 MHz instrument. The spectra were measured in CDCl3 relative to TMS (0.00 ppm). IR spectra were recorded on a PerkinElmer 781 spectrophotometer. Elemental analysis was performed on a Heraeus CHN-O-Rapid analyzer. Melting points were determined in open capillaries with a Buchi B-510 melting point apparatus. TLC was performed on Polygram SIL G/UV 254 silica gel plates.

2.2 General procedure

To a mixture of aldehyde (1 mmol), aromatic amine (1 mmol) and acetylenic esters (1 mmol) in ethyl acetate (5 mL), Al(HSO4)3 (0.05 g) was added as the catalyst, and the mixture was stirred for an appropriate time at room temperature. The progress of the reaction was monitored by TLC. Upon completion, the solvent was concentrated and the reaction mixture was diluted in CH2Cl2; the catalyst was isolated by simple filtration, and the crude product was washed with diethyl ether to afford the pure product.

2.3 Selected data

2.3.1 Methyl 4-(p-tolylamino)-2,5-dihydro-5-oxo-2-phenylfuran-3-carboxylate (1a)

1H NMR (400 MHz, CDCl3): 2.25 (s, 3H), 3.81 (s, 3H), 5.69 (s, 1H), 7.06 (d, J = 8.1 Hz, 2H), 7.14-7.38 (m, 7H), 8.93 (s, 1H, NH) ppm; IR (KBr): 3226, 2951, 1706, 1679, 1514, 1466, 1378, 1305, 1235, 1202, 1139, 998, 829, 811, 772 cm−1; found: C, 70.69; H, 5.38; N, 4.39 C19H17NO4; requires: C, 70.58; H, 5.30; N, 4.33%.

2.3.2 Methyl 4-(p-tolylamino)-2,5-dihydro-5-oxo-2-p-tolylfuran-3-carboxylate (3a)

1H NMR (400 MHz, CDCl3): 2.28 (s, 3H), 2.54 (s, 3H), 3.77 (s, 3H), 5.71 (s, 1H), 7.07 (d, J = 8.3 Hz, 2H), 7.15 (d, J = 8.3 Hz, 2H), 7.29 (d, J = 8.3 Hz, 2H), 7.39 (d, J = 8.3 Hz, 2H), 8.89 (s, 1H, NH) ppm; 13C NMR (100 MHz, CDCl3) δ: 20.7, 34.2, 51.8, 61.5, 112.9, 122.3, 125.6, 126.7, 129.7, 131.8, 133.5, 135.6, 151.3, 156.1, 162.8, 165.3 ppm IR (KBr): 3222, 2954, 1682, 1613, 1515, 1463, 1309, 1255, 1137, 1032, 994, 896, 848, 747 cm−1; found: C, 71.27; H, 5.77; N, 4.21 C20H19NO4; requires: C, 71.20; H, 5.68; N, 4.15%.

2.3.3 Ethyl 4-(p-tolylamino)-2,5-dihydro-5-oxo-2-p-tolylfuran-3-carboxylate (4a)

1H NMR (400 MHz, CDCl3): 1.26 (t, J = 6.8 Hz, 3H), 2.28 (s, 3H), 2.54 (s, 3H), 4.08 (q, J = 6.8 Hz, 2H), 5.72 (s, 1H), 7.08 (d, J = 8.2 Hz, 2H), 7.14 (d, J = 8.2 Hz, 2H), 7.30 (d, J = 8.2 Hz, 2H), 7.41 (d, J = 8.3 Hz, 2H), 8.89 (s, 1H, NH) ppm; 13C NMR (100 MHz, CDCl3) δ: 14.3, 20.6, 34.1, 51.6, 61.6, 112.9, 122.4, 125.6, 126.8, 129.6, 131.9, 133.5, 135.6, 151.2, 156.1, 162.6, 165.1 ppm IR (KBr): 3224, 3026, 2951, 1703, 1681, 1615, 1511, 1461, 1310, 1254, 1138, 1030, 994, 848, 745 cm−1; found: C, 71.88; H, 6.09; N, 4.05 C21H21NO4; requires: C, 71.78; H, 6.02; N, 3.99%.

2.3.4 Methyl 4-(p-tolylamino)-2-(4-chlorophenyl)-2,5-dihydro-5-oxofuran-3-carboxylate (5a)

1H NMR (400 MHz, CDCl3): 2.29 (s, 3H), 3.88 (s, 3H), 5.73 (s, 1H), 7.08 (d, J = 8.2 Hz, 2H), 7.16 (d, J = 8.2 Hz, 2H), 7.35 (d, J = 8.5 Hz, 2H), 7.51 (d, J = 8.5 Hz, 2H), 9.02 (s, 1H, NH) ppm; 13C NMR (100 MHz, CDCl3) δ: 20.3, 51.6, 60.8, 113.0, 122.9, 125.9, 126.8, 128.8, 129.2, 131.4, 134.9, 143.3, 156.1, 162.5, 165.4 IR (KBr): 3218, 2952, 1715, 1684, 1596, 1496, 1456, 1370, 1282, 1232, 1197, 1132, 1092, 1011, 928, 831, 7610 cm−1; found: C, 63.89; H, 4.63; N, 4.01 C19H16ClNO4; requires: C, 63.78; H, 4.51; N, 3.91%.

2.3.5 Methyl 4-(p-tolylamino)-2-(4-tert-butylphenyl)-2,5-dihydro-5-oxofuran-3-carboxylate (6a)

1H NMR (400 MHz, CDCl3): 1.27 (s, 9H), 2.27 (s, 3H), 3.76 (s, 3H), 5.70 (s, 1H), 7.09 (d, J = 8.4 Hz, 2H), 7.14 (d, J = 8.4 Hz, 2H), 7.27 (d, J = 8.4 Hz, 2H), 7.37 (d, J = 8.4 Hz, 2H), 8.92 (s, 1H, NH) ppm; 13C NMR (100 MHz, CDCl3) δ: 20.8, 31.1, 34.4, 51.9, 61.2, 112.7, 122.1, 125.4, 126.8, 129.4, 131.7, 133.6, 135.4, 151.2, 155.9, 162.7, 165.2 ppm IR (KBr): 3223, 2951, 1710, 1675, 1511, 1467, 1375, 1305, 1210, 1139, 825, 771 cm−1; found: C, 72.89; H, 6.71; N, 3.75 C23H25NO4; requires: C, 72.80; H, 6.64; N, 3.69%.

2.3.6 Ethyl 4-(p-tolylamino)-2-(4-tert-butylphenyl)-2,5-dihydro-5-oxofuran-3-carboxylate (7a)

1H NMR (400 MHz, CDCl3): 1.25-1.29 (m, 12H), 2.28 (s, 3H), 4.05 (q, J = 6.7 Hz, 2H), 5.70 (s, 1H), 7.08 (d, J = 8.3 Hz, 2H), 7.13 (d, J = 8.3 Hz, 2H), 7.27 (d, J = 8.3 Hz, 2H), 7.38 (d, J = 8.3 Hz, 2H), 8.91 (s, 1H, NH) ppm; 13C NMR (100 MHz, CDCl3) δ: 14.5, 20.8, 31.2, 34.5, 51.8, 61.5, 112.7, 122.3, 125.4, 126.7, 129.5, 131.9, 133.7, 135.4, 151.5, 156.2, 162.6, 165.4 ppm IR (KBr): 3221, 3024, 2950, 1709, 1675, 1512, 1375, 1212, 1139, 826, 771 cm−1; found: C, 73.35; H, 6.99; N, 3.64 C24H27NO4; requires: C, 73.26; H, 6.92; N, 3.56%.

2.3.7 Methyl 4-(4-chlorophenylamino)-2,5-dihydro-5-oxo-2-p-tolylfuran-3-carboxylate (8a)

1H NMR (400 MHz, CDCl3): 2.55 (s, 3H), 3.83 (s, 3H), 5.75 (s, 1H), 7.07 (d, J = 8.0 Hz, 2H), 7.17 (d, J = 8.0 Hz, 2H), 7.32 (d, J = 8.2 Hz, 2H), 7.45 (d, J = 8.2 Hz, 2H), 8.98 (s, 1H, NH) ppm; 13C NMR (100 MHz, CDCl3) δ: 20.4, 61.5, 51.6, 112.9, 123.1, 126.8, 128.4, 128.8, 129.2, 131.4, 134.8, 134.9, 156.3, 162.6, 165.4 IR (KBr): 3219, 2952, 1714, 1684, 1595, 1496, 1456, 1426, 1371, 1338, 1283, 1232, 1197, 1132, 1092, 1011, 928, 831, 805, 760, 711, 699 cm−1; found: C, 63.89; H, 4.60; N, 3.99 C19H16ClNO4; requires: C, 63.78; H, 4.51; N, 3.91%.

2.3.8 Methyl 4-(4-methoxyphenylamino)-2,5-dihydro-5-oxo-2-p-tolylfuran-3-carboxylate (10a)

1H NMR (400 MHz, CDCl3): 2.53 (s, 3H), 3.80 (s, 3H), 5.73 (s, 1H), 6.88 (d, J = 8.8 Hz, 2H), 7.05-7.09 (m, 4H), 7.31 (d, J = 8.8 Hz, 2H), 8.85 (s, 1H, NH) ppm; 13C NMR (100 MHz, CDCl3) δ: 19.7, 51.8, 55.3, 61.4, 112.1, 124.6, 125.3, 126.4, 128.1, 128.5, 135.8, 136.4, 144.1, 157.2, 163.4, 165.1 ppm IR (KBr): 3221, 2950, 1707, 1677, 1513, 1466, 1375, 1304, 1207, 1141, 828, 771 cm−1; found: C, 68.09; H, 5.51; N, 4.05 C20H19NO5; requires: C, 67.98; H, 5.42; N, 3.96%.

3 Results and discussion

Our initial aim was to develop an efficient one-pot procedure for the synthesis of 3,4,5-substituted furan-2(5H)-one derivatives through the reaction of aromatic amines, aldehydes and acetylenic esters by employing Al(HSO4)3. Accordingly, the transformation of 4-methylaniline, dimethylacetylenedicarboxylate and benzaldehyde into methyl 4-(p-tolylamino)-2,5-dihydro-5-oxo-2-phenylfuran-3-carboxylate was investigated (Table 1). The reaction was carried out by using different solvents (Table 1, entries 1–6) or solvent-free conditions (Table 1, entry 7) at room temperature. Lower yield of the product was achieved under solvent-free conditions. It was found that the best results were obtained when 0.05 g of Al(HSO4)3 in EtOAc as solvent was employed (Table 1, entry 4).

Table 1

Optimization of the reaction conditions for the synthesis of methyl 4-(p-tolylamino)-2,5-dihydro-5-oxo-2-phenylfuran-3-carboxylate.

EntryCatalyst (g)T (°C)Solvent (5 mL)Time (h)Yield (%)a
10.05r.t.n–Hexane845
20.05r.t.CH2Cl2850
30.05r.t.Et2O865
40.05r.t.EtOAc878
50.05r.t.EtOH851
60.05r.t.MeOH855
70.05r.t.–825
8–r.t.EtOAc10–
90.025r.t.EtOAc1065
100.075r.t.EtOAc677
110.1r.t.EtOAc576

a Isolated yields.

To find out the optimized amount of Al(HSO4)3, the reaction was carried out by varying the quantity of catalyst (Table 1, entries 9–11). The maximum yield was obtained when 0.05 g of catalyst was used (Table 1, entry 4). Further increase in the amount of Al(HSO4)3 in the mentioned reaction did not have any significant effect on the product yield. The results are summarized in Table 1.

Next, the scope and efficiency of these procedures were explored for the synthesis of a wide variety of substituted 3,4,5-substituted furan-2(5H)-ones (Scheme 1, Table 2).

Table 2

Synthesis of 3,4,5-substituted furan-2(5H)-one derivatives (Scheme 1).

ProductAldehydeAmineRTime (h)Yield (%)a
1aBenzaldehyde4-MethylanilineMe878
2aBenzaldehyde4-MethylanilineEt880
3a4-Methylbenzaldehyde4-MethylanilineMe789
4a4-Methylbenzaldehyde4-MethylanilineEt790
5a4-Chlorobenzaldehyde4-MethylanilineMe1071
6a4-tert-Butylbenzaldehyde4-MethylanilineMe881
7a4-tert-Butylbenzaldehyde4-MethylanilineEt880
8a4-Methylbenzaldehyde4-ChloroanilineMe1085
9aBenzaldehyde4-ChloroanilineMe1079
10a4-Methylbenzaldehyde4-MethoxyanilineMe786
11aBenzaldehydeAnilineMe884
12aBenzaldehydeAnilineEt977
13a4-MethylbenzaldehydeAnilineMe886
14a4-MethylbenzaldehydeAnilineEt884
15a4-ChlorobenzaldehydeAnilineMe1075
16a2-ChlorobenzaldehydeAnilineMe1270
17a2,4-DichlorobenzaldehydeAnilineMe1280

a Isolated yields. All known products had been reported previously in the literature and were characterized by comparison of their IR and NMR spectra with those of authentic samples [27,28].

Generally, the results were excellent in terms of yield and product purity. A series of aromatic aldehydes and amines were investigated (Table 2, products 1a–17a). In all cases, aromatic aldehydes containing electron-donating groups gave shorter times and higher yields than that with electron-withdrawing groups.

The work-up procedure is very clear-cut; this means that the products were isolated and purified by simple filtration and washing with diethyl ether. Our protocol making use of Al(HSO4)3 during the reaction process is better than those using hazardous liquid acidic catalysts.

4 Conclusion

In summary, an efficient protocol for the preparation of 3,4,5-substituted furan-2(5H)-one derivatives was described. The reactions were carried out under ambient conditions with short reaction times and produce the corresponding products in good yields. The present methodology offers several advantages such as good yields, simple procedure, shorter reaction times and milder conditions; moreover, the products were purified without having resort to chromatography.

Acknowledgments

We are thankful to the Najafabad Branch, Islamic Azad University research council for partial support of this research.

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