CID 406 → HCID 54032013, Verbindung

Temperatur

0 °C

Sodium hydride (102 mg of a 60% suspension in mineral oil, 4.3 mmol) was slurried in dry 1,2-dimethoxyethane (DME) under argon, cooled to 0° C. in an ice bath, and diethylbenzyl phosphonate (0.89 mL, 4.3 mmol) was added dropwise to the suspension. Thirty minutes after the completion of the phosphonate addition, 4-methylthiazole-2-carboxaldehyde (120 mg, 0.94 mmol) was added as a solution in DME (5 mL). After stirring for 4 h, further NaH (40 mg of a 60% suspension in mineral oil, 1.0 mmol) was added and the reaction mixture was allowed to warm to ambient temperature and stir for 16 h. The reaction mixture was quenched by the addition of water (20 mL) and ethyl acetate (50 mL). The aqueous phase was extracted with ethyl acetate (2×30 mL), the combined organics were dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography on silica gel eluting with 90:10 hexane:ethyl acetate to afford 4-methyl-2-[2-phenylethenyl]-1,3-thiazole (30 mg, 16% yield) as an oil. 1H NMR analysis showed the material to be a 10:1 mixture of E and Z isomers (spectral data are reported for the major isomer). 1H NMR (CDCl3,300 MHz) δ: 7.54-7.51 (m, 2H) 7.42-7.23 (m, 5H) 6.80 (s, 1H) 2.47 (s, 3H). MS (ESI) (minor isomer) 202.2 (M++H), (major isomer) 201.6 (M+).

1. temperatureto warm to ambient temperature
2. stirringstir for 16 h
3. customThe reaction mixture was quenched by the addition of water (20 mL) and ethyl acetate (50 mL)
4. extractionThe aqueous phase was extracted with ethyl acetate (2×30 mL)
5. dry with materialthe combined organics were dried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customThe crude product was purified by column chromatography on silica gel eluting with 90:10 hexane

ORD-Eintrag

ord-1bf5a34f982441ba9b8bbfa4d7d2df56

Quelldatensatz

uspto-grants-2005_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06956049B1