2-Methyl-2-butene → 2-(1-(Tert-butoxycarbonyl)pyrrolidin-3-yl)thiazole-5-carboxylic acid

Participants

Reaction Steps

tert-Butyl 3-(5-formylthiazol-2-yl)pyrrolidine-1-carboxylate (3.65 g, 12.93 mmol) was suspended in water (35 ml) and t-butanol (60 ml). Sodium dihydrogenphosphate (2.094 g, 17.45 mmol) was added, followed by 2-methylbut-2-ene (5.34 ml, 50.4 mmol). After 5 minutes, sodium chlorite (2.92 g, 32.3 mmol) was added in portions over about 5 minutes (mildly exothermic). The reaction was stirred for 1 hour at room temperature, then additional 2-methyl-2-butene (2 mL) was added. After stirring for 2 hours at room temperature, the reaction was concentrated and water (100 mL) was added. The mixture was adjusted to pH 2 by addition of 1N hydrochloric acid, then extracted dichloromethane. The organic extracts were dried over sodium sulfate, filtered and concentrated to provide the title compound.

Provenance & Evidence