Sodium Sulfate → 4-(Hydroxymethyl)-2-phenyl-1,3-thiazole

Temperatur

-78 °C

In a 250 mL round-bottom flask, methyl 2-phenylthiazole-4-carboxylate (Example 3A, 1.50 g, 6.43 mmol) was dissolved in ethyl ether (40 mL). The solution was cooled down to −78° C. and treated with lithium aluminum hydride (0.75 g, 19.76 mmol) portionwise over 20 minutes. The reaction was stirred at −78° C. for 3.5 hours, then treated with 20 mL of a saturated solution of Na2SO4. The reaction was allowed to reach RT and was diluted with ethyl acetate, washed with HCl 1N (1×), brine (1×), dried over anhydrous magnesium sulfate, filtered and concentrated. The residue was purified by silica gel chromatography (3×12 cm, 30% ethyl acetate/dichloromethane) to give a pale yellow oil (1.06 g) which was then distilled (bulb to bulb, bp: 110-120° C./0.2 torr) and provided the title material (0.88 g, 72%) as a clear oil. 1H NMR (CDCl3, 400 MHz): 7.95-7.90 (m, 2H) 7.45-7.40 (m, 3H) 7.16 (s, 1H) 4.82 (s, 2H) 2.34 (br s, 1H).

1. customto reach RT
2. washwashed with HCl 1N (1×), brine (1×)
3. dry with materialdried over anhydrous magnesium sulfate
4. filtrationfiltered
5. concentrationconcentrated
6. customThe residue was purified by silica gel chromatography (3×12 cm, 30% ethyl acetate/dichloromethane)

ORD-Eintrag

ord-4cba2f33f2e64b58a1289dc824ff98e2

Quelldatensatz

uspto-grants-2016_04

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09303065B2