Imidazole → (+)-2,2-Dimethyl-5-oxo-1,3-dioxolane-4-acetic Acid, Tert-butyldimethylsilyl Ester

HRID 2214493Notes

Reaction equation

[CH3:1][C:2]1([CH3:12])[O:6][C@@H:5]([CH2:7][C:8]([OH:10])=[O:9])[C:4](=[O:11])[O:3]1.N1C=CN=C1.[Si:18](Cl)([C:21]([CH3:24])([CH3:23])[CH3:22])([CH3:20])[CH3:19]>CN(C)C=O.C1(C)C=CC=CC=1>[CH3:1][C:2]1([CH3:12])[O:6][CH:5]([CH2:7][C:8]([O:10][Si:18]([C:21]([CH3:24])([CH3:23])[CH3:22])([CH3:20])[CH3:19])=[O:9])[C:4](=[O:11])[O:3]1

Participants

Conditions

Temperature: 22 °C

Procedure

A solution of (S)-(+)-2,2-dimethyl-5-oxo-1,3-dioxolane-4-acetic acid (13.20 g, 75.8 mmol) in N,N-dimethylformamide (25 ml) was treated at 22° C. with imidazole (10.56 g, 0.155 mmol) followed by tert-butyldimethylsilyl chloride (12.0 g, 79.6 mmol) and the resulting mixture was stirred at 22° C. for 18 hours. The reaction mixture was then diluted with toluene (500 ml), washed with water (×3), saturated sodium bicarbonate and brine. After drying (magnesium sulfate), the solvent was evaporated under reduced pressure to give an oil. Distillation under vacuum gave 20.9 g (96% yield) of the title material as a clear oil: Bp 80–90° C./0.1 torr (bulb to bulb distillation, air bath temperature). 1H NMR (400 MHz, CDCl3) δ: 0.33 (s, 3), 0.36 (s, 3), 1.00 (s, 9), 1.11 (s, 3), 1.37 (s, 3), 2.72 (m, 2), 4.35 (dd, 1, J=4, 6).

Workup

washwashed with water (×3), saturated sodium bicarbonate and brine
dry with materialAfter drying (magnesium sulfate)
customthe solvent was evaporated under reduced pressure
customto give an oil
distillationDistillation under vacuum

Sources & evidence

ORD record: ord-932610ff259e48c1bb527ddd00ecbd60
Source dataset: uspto-grants-2006_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07109186B2

Reaction notes

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