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Article

SnCl2/TiCl3-Mediated Deoximation of Oximes in an Aqueous Solvent

by
Mei-Huey Lin
*,
Han-Jun Liu
,
Cheng-Yu Chang
,
Wei-Cheng Lin
and
Tsung-Hsun Chuang
Department of Chemistry, National Changhua University of Education, Changhua 50007, Taiwan
*
Author to whom correspondence should be addressed.
Molecules 2012, 17(3), 2464-2473; https://doi.org/10.3390/molecules17032464
Submission received: 30 January 2012 / Revised: 23 February 2012 / Accepted: 27 February 2012 / Published: 1 March 2012
(This article belongs to the Section Organic Chemistry)
Browse Figure
Versions Notes

Abstract

:
A simple procedure for SnCl2/TiCl3-mediated deoximation of ketoximes in an aqueous solvent is reported. Under the conditions developed in this effort, various ketones and aldehydes are produced in good to excellent yields.

Graphical Abstract

1. Introduction

Oximes are often used in organic synthesis as protected forms of carbonyl compounds [1] or as carbonyl derivatives for purification and characterization purposes [2]. Furthermore, oximes can be prepared from noncarbonyl compounds, such as nitroalkanes [3,4,5], or primary amines [6], thus deoximation provides an alternative approach for the syntheses of aldehydes and ketones. A plethora of examples of procedures for the regeneration of carbonyl compounds from oximes have been reported. So far a good number of deoximation methods based on hydrolytic [7], reductive [8,9,10,11,12], oxidative [13,14,15,16,17,18,19], and transoximation [20,21,22] reactions have been developed. Among them some require strong acidic conditions; some take long reaction times, and give low product yields, while some are performed at higher temperatures. For example, regeneration of carbonyl compounds from oximes via direct hydrolysis usually involves strong acidic conditions due to the relatively high hydrolytic stability of oximes, and thus leads to the damage of acid-sensitive groups and the formation of amides as byproducts by Beckmann rearrangement [23,24]. Besides, most of reductive and oxidative methods require reagents that are often hazardous or very toxic, expensive or not readily available. Therefore, a milder, high yielding, and inexpensive method is still in demand.
Tin and tin-containing Lewis acids have been extensively used in organic chemistry owing to their low cost, commercial availability and modestly low toxicity [25,26]. Deoximation of oximes by using SnCl2-SiO2 has been reported. However, harsh reaction conditions are applied such as reflux or microwave irradiation at high temperature [27,28]. Several examples of mild methods that use tin metal and stannic chloride to promote allylation reactions of protected carbonyls such as enol ethers and acetals in aqueous media have been described [29,30,31,32]. Apparently, the protected carbonyls are hydrolyzed to the corresponding aldehydes, which then undergo allylation in the presence of allyl anion equivalents. In this regard, we envisioned that deoximation of oximes by tin-mediated hydrolysis reactions under aqueous and mild conditions should be possible. Below, we describe the results of a study which demonstrate that oximes serve as starting materials for tin promoted hydrolysis reactions.

2. Results and Discussion

The effort began with an investigation of metal- or metal halide-mediated aqueous deoximation of acetophenone oxime (1a). The conditions employed and the results of the reactions are presented in Table 1 [33].
Table
Table 1. Metal- or metal halide-mediated deoximation of ketoxime a. Molecules 17 02464 i001
Table 1. Metal- or metal halide-mediated deoximation of ketoxime a. Molecules 17 02464 i001
EntryMetalTime, conversion b
1TiCl34 h, 12%
2SnCl24 h, 14%
3SnCl2/TiCl34 h, 99+%
4SnCl2/KI4 h, 14%
5Sn/TiCl34 h, 80%
6Mn/TiCl34 h, 23%
7In/TiCl34 h, 55%
8Fe/TiCl34 h, 53%
9Cu/TiCl34 h, 39%
10Zn/TiCl34 h, 56% c
11 dTiCl34 h, 92%
12 dSnCl24 h, 26%
a Conditions: 1a (1.0 mmol) and indicated metal or metal halide (1.5 mmol) in THF (1.0 mL)/water (1.0 mL) at r.t.; b conversion was determined by 1H-NMR; c Isolated yield; d Conditions: 1a (1.0 mmol) and indicated metal halide (3.0 mmol) in THF (1.0 mL)/water (1.0 mL) at r.t.
The results show that SnCl2/TiCl3 serves as a superior reagent for the deoximation of acetophenone oxime (1a) in aqueous medium (Table 1, entry 3). It is reported that SnCl2 is prone to partial hydrolysis in water and generates an acidic solution [34]. However, the results showed that the acidic conditions generated are not sufficient to promote regeneration of carbonyl compounds from ketoxime in aqueous solvent (Table 1, entries 2, 4 and 12). The reduction of oximes to form imines, using trivalent titanium reductant or utilizing a low-valent titanium reagent generated from TiCl4/SnCl2 has been described [35,36,37,38]. However, these reactions are performed under anhydrous conditions and excess amounts of reagents are employed. Thus, we envisaged that imines formed in this manner would be susceptible to rapid hydrolysis to produce ketones. Herein, a commercially available titanium trichloride 20% in 3% hydrochloric acid was employed in this study. The intervention and effect of this reduction process are seen by comparing the rates of reactions promoted by using various low-valent titanium reagents (Table 1, entries 1, 3 and 5–11). It is important to note that the deoximation process was deteriorated by using low-valent titanium generated from zinc (Table 1, entry 10).
Table
Table 2. SnCl2/TiCl3-mediated deoximation of ketoximes a. Molecules 17 02464 i002
Table 2. SnCl2/TiCl3-mediated deoximation of ketoximes a. Molecules 17 02464 i002
EntrySubstrateTime, yieldEntrySubstrateTime, yield
1 Molecules 17 02464 i0034 h, 96%9 Molecules 17 02464 i0045 h, 89%
2 Molecules 17 02464 i0056 h, 92%10 Molecules 17 02464 i0069 h, 97%
3 Molecules 17 02464 i0079 h, 92%11 Molecules 17 02464 i0086 h, 97%
4 Molecules 17 02464 i0094 h, 84%12 Molecules 17 02464 i0109 h, 99%
5 Molecules 17 02464 i0119 h, 82%13 Molecules 17 02464 i0129 h, 83%
6 Molecules 17 02464 i0139 h, 98%14 Molecules 17 02464 i0143 h, 91%
7 Molecules 17 02464 i0153 h, 95%15 Molecules 17 02464 i0167 h, 92%
8 Molecules 17 02464 i0172.5 h, 94%
a Conditions: ketoxime 1 (1.0 mmol), SnCl2 (1.5 mmol) and TiCl3 (1.5 mmol) in THF (1.0 mL)/water (1.0 mL) at r.t.
Next, the substrate scope of the deoximation reactions of ketoximes was probed under the SnCl2/TiCl3-mediated conditions (Table 2). It is found that the amount of TiCl3 could be lowered but it depends on the substrate. For example, a catalytic amount of TiCl3 (0.25 equivalent) accompanied with SnCl2 (1.0 equivalent) was able to deoximate acetophenone oxime (1a) but at least one equivalent of TiCl3 was required to deoximate oxime 1k. Therefore, we chose fixed amounts of SnCl2 and TiCl3 (1.5 equivalents each) as a general procedure for deoximation of various ketoximes shown in Table 2. As can be seen by viewing the results displayed in Table 2, the yields of these processes starting with both aromatic (Table 2, entries 1–13) and aliphatic (Table 2, entries 14 and 15) oximes, are good to excellent. Interestingly, the presence of an amide group that is present in 1e (Table 2, entry 5) and a free phenol group that is present in 1h (Table 2, entry 8) do not alter the efficiency of the reaction. In addition, aromatic halogen (1b, 1f), nitrile (1c), and alkoxyl (1d, 1g, 1l) as well as olefin (1o) were tolerated under this mild condition.
With the excellent results from deoximation of ketoximes, we turned our attention to deoximation of aldoximes with the same approach and the results are shown in Table 3. Deoximation worked well for aldoximes 1p, 1q, and 1r with the SnCl2/TiCl3 system (entries 3, 6 and 9, Table 3) and deoximation products were obtained in excellent yields under this mild condition. Due to poor solubility of aldoxime 1r in water, THF is added to boost the reaction to complete (entry 9 vs. entry 10, Table 3).
Table
Table 3. Metal halide-mediated deoximation of aldoxime a. Molecules 17 02464 i018
Table 3. Metal halide-mediated deoximation of aldoxime a. Molecules 17 02464 i018
EntrySubstrateMetalSolventTime Conversion b (%)
1 Molecules 17 02464 i019TiCl3H2O2 h33
21pSnCl2H2O2 h4
31pSnCl2/TiCl3H2O2 h99 (96) c
4 Molecules 17 02464 i020TiCl3H2O5 h12
51qSnCl2H2O5 h<1
61qSnCl2/TiCl3H2O5 h99 (93) c
7 Molecules 17 02464 i021TiCl3THF/H2O (1/3)4 h17
81rSnCl2THF/H2O (1/3)4 h9
91rSnCl2/TiCl3THF/H2O (1/3)4 h99 (97) c
101rSnCl2/TiCl3H2O6 h71
a Conditions: aldoxime 1 (1.0 mmol) and indicated metal halide (1.0 mmol) in solvent (2.0 mL) at r.t.; b Conversion was determined by 1H-NMR; c Isolated yield of 2.

3. Experimental

3.1. General Information and Materials

All commercially available chemicals were used without further purification. Oximes were prepared according to the reported procedures [39]. TLC analyses were run on a glass plate (Silica gel 60 F254) and were visualized using UV or a solution of phosphomolybdic acid in ethanol (5 wt%) or p-anisaldehyde stain. Flash chromatography was performed using silica gel (70–230 mesh). 1H and 13C-NMR spectra were recorded on a 300 MHz spectrometer (Bruker AV-300). Chemical shifts are reported relative to CHCl3 [δH 7.24, δC (central line) 77.0]. Mass spectra and high-resolution mass spectra were recorded under electron spray interface (ESI) conditions (Finnigan/Thermo Quest MAT).

3.2. General Procedure for SnCl2/TiCl3-Mediated Deoximation of Ketoximes in an Aqueous Solvent

Tin chloride dihydrate (345 mg, 1.5 mmol) and titanium(III) chloride, (0.96 mL, 1.5 mmol, 20% in 3% hydrochloric acid) were added successively to a solution of oxime 1 (1.0 mmol) in THF (1 mL)/water (1 mL) at r.t. The mixture was stirred at ambient temperature until all the starting material was consumed, the solution was extracted with Et2O (3 × 5 mL). The combined organic layers were dried over MgSO4, filtered, and concentrated in vacuo, giving a residue which was subjected to silica gel chromatography to furnish the pure ketone 2.
Acetophenone (2a). Following the general procedure, the title compound was obtained (115 mg, 96%). Oil; TLC (EtOAc/hexanes (1:2)) R f= 0.58; 1H-NMR (CDCl3): δ 2.58 (s, 3H), 7.41–7.54 (m, 3H), 7.93 (dd, J = 8.4, 1.2 Hz, 2H). Data are in good agreement with the literature [40].
1-(3-Bromophenyl)ethanone (2b). Following the general procedure, the title compound was obtained (183 mg, 92%). Oil; TLC (EtOAc/hexanes (1:4)) R f= 0.68; 1H-NMR (CDCl3): δ 2.57 (s, 3H), 7.33 (t, J = 7.8 Hz, 1H), 7.65–7.69 (m, 1H), 7.84–7.87 (m, 1H), 8.06 (d, J = 2.1 Hz, 1H). Data are in good agreement with the literature [41].
3-Acetylbenzonitrile (2c). Following the general procedure, the title compound was obtained (134 mg, 92%). Oil; TLC (Et2O/hexanes (1:2)) R f= 0.25; 1H-NMR (CDCl3): δ 2.62 (s, 3H), 7.59 (t, J = 7.8 Hz, 1H), 7.80–7.84 (m, 1H), 8.14–8.21 (m, 2H). Data are in good agreement with the literature [42].
1-(3-Methoxyphenyl)ethanone (2d). Following the general procedure, the title compound was obtained (126 mg, 84%). Oil; TLC (EtOAc/hexanes (1:4)) R f= 0.75; 1H-NMR (CDCl3): δ 2.58 (s, 3H), 3.84 (s, 3H), 7.07–7.11 (m, 1H), 7.35 (t, J = 7.8 Hz, 1H), 7.46–7.53 (m, 2H). Data are in good agreement with the literature [43].
N-(3-Acetylphenyl)acetamide (2e). Following the general procedure, the title compound was obtained (145 mg, 82%). Oil; TLC (EtOAc/hexanes (1:2)) R f= 023; 1H-NMR (CDCl3): δ 2.17 (s, 3H), 2.52 (s, 3H), 7.33 (t, J = 7.8 Hz, 1H), 7.59 (d, J = 7.8 Hz, 1H), 7.91 (d, J = 7.8 Hz, 1H), 8.05 (s, 1H), 8.85 (s, 1H). Data are in good agreement with the literature [44].
1-(4-Bromophenyl)ethanone (2f). Following the general procedure, the title compound was obtained (195 mg, 98%). Oil; TLC (EtOAc/hexanes (1:4)) R f= 0.53; 1H-NMR (CDCl3): δ 2.56 (s, 3H), 7.57 (d, J = 7.8 Hz, 2H), 7.78 (d, J = 7.8 Hz, 2H). Data are in good agreement with the literature [45].
1-(4-Methoxyphenyl)ethanone (2g). Following the general procedure, the title compound was obtained (143 mg, 95%). Oil; TLC (EtOAc/hexanes (1:9)) R f= 0.43; 1H-NMR (CDCl3): δ 2.52 (s, 3H), 3.81 (s, 3H), 6.86 (d, J = 7.8 Hz, 2H), 7.87 (d, J = 7.8 Hz, 2H). Data are in good agreement with the literature [46].
1-(4-Hydroxyphenyl)ethanone (2h). Following the general procedure, the title compound was obtained (128 mg, 94%). Oil; TLC (Et2O/hexanes (1:2)) R f= 0.58; 1H-NMR (CDCl3): δ 2.54 (s, 3H), 6.08 (s, 1H), 6.87 (d, J = 8.4 Hz, 2H), 7.89 (d, J = 8.4 Hz, 2H). Data are in good agreement with the literature [45].
Propiophenone (2i). Following the general procedure, the title compound was obtained (119 mg, 89%). Oil; TLC (Et2O/hexanes (1:2)) R f= 0.58; 1H-NMR (CDCl3): δ 1.20 (t, J = 7.5 Hz, 3H), 2.97 (q, J = 7.5 Hz, 2H), 7.40–7.53 (m, 3H), 7.93 (d, J = 7.8 Hz, 2H). Data are in good agreement with the literature [45].
1,2-Diphenylethanone (2j). Following the general procedure, the title compound was obtained (190 mg, 97%). Oil; TLC (Et2O/hexanes (1:2)) R f= 0.63; 1H-NMR (CDCl3): δ 4.28 (s, 2H), 7.25–7.35 (m, 5H), 7.42–7.57 (m, 3 H), 8.00 (t, J = 2.1 Hz, 2H). Data are in good agreement with the literature [47].
1-(Naphthalen-2-yl)ethanone (2k). Following the general procedure, the title compound was obtained (165 mg, 97%). Oil; TLC (Et2O/hexanes (1:4)) R f= 0.45; 1H-NMR (CDCl3): δ 2.71 (s, 3H), 7.54–7.59 (m, 2H), 7.85–8.03 (m, 4H), 8.45 (s, 1H). Data are in good agreement with the literature [40].
5-Methoxy-3,4-dihydronaphthalen-1(2H)-one (2l). Following the general procedure, the title compound was obtained (174 mg, 99%). Oil; TLC (Et2O/hexanes (1:2)) R f= 0.30; 1H-NMR (CDCl3): δ 2.05–2.15 (m, 2H), 2.61–2.65 (m, 2H), 2.87 (t, J = 6.3 Hz, 2H), 3.84 (s, 3H), 7.01 (d, J = 7.8 Hz, 1H), 7.24 (d, J = 7.8 Hz, 1H), 7.61 (d, J = 7.8 Hz, 1H). Data are in good agreement with the literature [48].
1-(Benzofuran-2-yl)ethanone (2m). Following the general procedure, the title compound was obtained (133 mg, 83%). Oil; TLC (Et2O/hexanes (1:2)) R f= 0.40; 1H-NMR (CDCl3): δ 2.59 (s, 3H), 7.24–7.32 (m, 1H), 7.45–7.49 (m, 2H), 7.54–7.58 (m, 1H), 7.67–7.71 (m, 1H). Data are in good agreement with the literature [49].
Cyclohexanone (2n). Following the general procedure, the title compound was obtained (89 mg, 91%). Oil; TLC (Et2O/hexanes (1:2)) R f= 0.45; 1H-NMR (CDCl3): δ 1.64–1.87 (m, 6H), 2.28–2.32 (m, 4H). Data are in good agreement with the literature [50].
1-Cyclohexenylethanone (2o). Following the general procedure, the title compound was obtained (114 mg, 92%). Oil; TLC (Et2O/hexanes (1:2)) R f= 0.53; 1H-NMR (CDCl3): δ 1.58–1.61 (m, 4H), 2.19–2.24 (m, 4H), 2.25 (s, 3H), 6.85–6.88 (m, 1H). Data are in good agreement with the literature [51].

3.3. General Procedure for SnCl2/TiCl3-Mediated Deoximation of Aldoximes in an Aqueous Solvent

Tin chloride dihydrate (230 mg, 1.0 mmol) and titanium(III) chloride, (0.64 mL, 1.0 mmol, 20% in 3% hydrochloric acid) were added successively to a solution of aldoxime 1 (1.0 mmol) in H2O (2 mL) or THF/water (1/3, 2 mL) at rt. The mixture was stirred at ambient temperature until all the starting material was consumed, the solution was extracted with Et2O (3 × 5 mL). The combined organic layers were dried over MgSO4, filtered, and concentrated in vacuo, giving a residue which was subjected to silica gel chromatography to furnish the pure aldehyde 2.
Benzaldehyde (2p). Following the general procedure, the title compound was obtained (102 mg, 96%). Oil; TLC (Et2O/hexanes (1:2)) R f= 0.63; 1H-NMR (CDCl3): δ 7.47–7.52 (m, 2H), 7.57–7.63 (m, 1H), 7.83–7.87 (m, 2H), 9.99 (s, 1H). Data are in good agreement with the literature [52].
4-Chlorobenzaldehyde (2q). Following the general procedure, the title compound was obtained (131 mg, 93%). Oil; TLC (Et2O/hexanes (1:2)) R f= 0.45; 1H-NMR (CDCl3): δ 7.48 (d, J = 9.0 Hz, 2H), 7.80 (d, J = 9.0 Hz, 2H), 9.96 (s, 1H). Data are in good agreement with the literature [52].
3,5-Dimethoxybenzaldehyde (2r). Following the general procedure, the title compound was obtained (161 mg, 97%). Oil; TLC (Et2O/hexanes (1:2)) R f= 0.43; 1H-NMR (CDCl3): δ 3.64 (s, 3H), 3.65 (s, 3H), 6.51 (d, J = 2.4 Hz, 1H), 6.81 (d, J = 2.4 Hz, 2H), 9.70 (s, 1H). Data are in good agreement with the literature [53].

4. Conclusions

In summary, we report a simple, mild and inexpensive method for deoximation of oximes in an aqueous solvent. This procedure appears to be advantageous in terms of chemical yield, reaction conditions, and functional group compatibility.

Supplementary Materials

Supplementary materials can be accessed at: https://www.mdpi.com/1420-3049/17/3/2464/s1.

Acknowledgments

Financial support from the National Science Council of the Republic of China, Taiwan (NSC100-2113-M-018-004-MY2) is gratefully acknowledged.
  • Samples Availability: Samples of the all compounds are available from the authors.

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MDPI and ACS Style

Lin, M.-H.; Liu, H.-J.; Chang, C.-Y.; Lin, W.-C.; Chuang, T.-H. SnCl2/TiCl3-Mediated Deoximation of Oximes in an Aqueous Solvent. Molecules 2012, 17, 2464-2473. https://doi.org/10.3390/molecules17032464

AMA Style

Lin M-H, Liu H-J, Chang C-Y, Lin W-C, Chuang T-H. SnCl2/TiCl3-Mediated Deoximation of Oximes in an Aqueous Solvent. Molecules. 2012; 17(3):2464-2473. https://doi.org/10.3390/molecules17032464

Chicago/Turabian Style

Lin, Mei-Huey, Han-Jun Liu, Cheng-Yu Chang, Wei-Cheng Lin, and Tsung-Hsun Chuang. 2012. "SnCl2/TiCl3-Mediated Deoximation of Oximes in an Aqueous Solvent" Molecules 17, no. 3: 2464-2473. https://doi.org/10.3390/molecules17032464

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