Lithium Hydroxide → HCID 74067277, compound

5-Methyl-2-phenyloxazole-4-carbaldehyde [Hulin, et al., J. Med. Chem. (1992) 35(10), 1853-64] (5.62 g, 30 mmol), triethylphosphonoacetate (6.55 mL, 33 mmol), and LiOH (1.38 g, 33 mmol) were dissolved in anhydrous THF (150 mL) and stirred for 18 h at ambient temperature under an atmosphere of nitrogen. The reaction mixture was then diluted with ether (100 mL) and washed with saturated NH4Cl solution (100 mL), then water (100 mL). The aqueous layers were back-extracted with ether (100 mL) and the combined organic layers were again washed with water (100 mL). The ether layer was dried over MgSO4 and concentrated. The resultant residual solids were purified by column chromatography (250 mg silica, 100% hexanes to 10% EtOAc/hexanes) to provide a white crystalline solid (3.46 g, 45%): Rf=0.55 (50% hexanes/EtOAc); 1H NMR (400 MHz, CDCl3) δ 7.97-8.05 (m, 2H), 7.50 (d, 1H), 7.40-7.44 (m, 3H), 6.63 (d, 2H) 4.26 (q, 2H), 2.43 (s, 3H), 1.33 (t, 3H); MS(EI): 258 (M+1).

1. washwashed with saturated NH4Cl solution (100 mL)
2. extractionThe aqueous layers were back-extracted with ether (100 mL)
3. washthe combined organic layers were again washed with water (100 mL)
4. dry with materialThe ether layer was dried over MgSO4
5. concentrationconcentrated
6. customThe resultant residual solids were purified by column chromatography (250 mg silica, 100% hexanes to 10% EtOAc/hexanes)

ORD record

ord-3751a91d84cf4e36a78356ef16c1f7b2

Source dataset

uspto-grants-2008_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07351728B2