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Hydrolysis of the ester 6-{(Acetyloxy)methyl}pyridin-3-yl acetate; 6-(Hydroxymethyl)pyridin-3-ol

SyntheticPage 548
DOI: 10.1039/SP548
Submitted Mar 26, 2012, published Apr 06, 2012
Rebecca Kaner (r.a.kaner@warwick.ac.uk)
A contribution from Scott group, Warwick University


			Reaction Scheme: Hydrolysis of the ester 6-{(Acetyloxy)methyl}pyridin-3-yl acetate

Chemicals Used

6-{(Acetyloxy)methyl}pyridin-3-yl acetate - from Synthetic Pages 547
Hydrochloric acid (36%)

Procedure

6-{(Acetyloxy)methyl}pyridin-3-yl acetate (36.59 g, 174.90 mmol) was dissolved in concentrated hydrochloric acid (36%, 400 ml). The black solution was stirred at reflux (110°C) for 24 h. After cooling to ambient temperature, the solvent was removed under reduced pressure until around 50 ml remained. An aqueous solution of sodium hydroxide (1 M) was added dropwise to neutralise the solution (pH 7.0). All solvent was then removed under reduced pressure and the crude brown-grey solid was dried overnight in vacuo at 50°C. The crude solid was then stirred in boiling acetonitrile (250 ml) and filtered hot. This process was repeated a further two times (2 × 250 ml). The yellow-pale brown filtrates were combined and the acetonitrile was removed under reduced pressure to leave the product as a yellow solid, which was dried overnight in vacuo. Yield = 15.81 g, 126.35 mmol, 72%.

Author's Comments

HCl gas can be released at the start of the reaction and needs to be neutalised via NaOH (1M) trap

Data

1H NMR (400 MHz, 298 K, DMSO) δH 9.72 (1H, br s, Py-OH), 8.02 (1H, d, 4JHH = 3.0 Hz, Py), 7.26 (1H, d, 3JHH = 8.5 Hz, Py), 7.15 (1H, dd, 3JHH = 8.5 Hz, 4JHH = 3.0 Hz, Py), 5.19 (1H, br s, CH2OH), 4.44 (1H, s, CH2).

13C{1H} NMR (100 MHz, 298K, DMSO) δC 152.2 (Py), 152.0 (Py), 136.3 (Py), 122.5 (Py), 121.0 (Py), 63.9 (CH2).

MS (ESI) m/z 126.1 [M+H]+, 148.1 [M+Na]+, 124.1 [M-H]-.

IR v cm-1 3439 w, 2407 w, 1765 w, 1570 m, 1483 m, 1461 m, 1445 m, 1335 m, 1270 s, 1209 s, 1127 m, 1117 m, 1072 s, 1027 m, 893 m, 858 m, 830 s, 760 m, 714 m, 656 s.

Elemental Analysis found (Calculated for C6H7NO2) % C 57.73 (57.59), H 5.51 (5.64), N 10.87 (11.19).


Lead Reference

M. Seredyuk, A. B. Gaspar, V. Ksenofontov, Y. Galyametdinov, J. Kusz and P. Gütlich, J. Am. Chem. Soc., 2008, 130, 1431-1439

Supplementary Information

1H NMR (6hydroxymethylpyridin3ol_1H.jcamp)
13C NMR (6hydroxymethylpyridin3ol_13C.jcamp)

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Keywords: alcohols, heterocyclic compounds, hydrolysis