Methanol → (1R,2S)-1-(((1,1-Dimethylethoxy)carbonyl)amino)-2-ethenylcyclopropanecarboxylic acid

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A round-bottom flask was charged with (1R,2S)-ethyl 1-((tert-butoxycarbonyl)amino)-2-vinylcyclopropanecarboxylate (4 g, 15.67 mmol) and lithium hydroxide monohydrate (2.63 g, 62.7 mmol). Methanol (52.2 ml), THF (52.2 ml) and water (52.2 ml) were added. The mixture was heated (oil bath at 45° C.) overnight. The reaction mixture was concentrated to half-its volume in rotavap and the pH of the mixture was adjusted to pH=2-3 with aq 1M HCl. The mixture was extracted with dichloromethane (3×150 mL). The combined organic extracts were washed with brine (50 mL), dried over magnesium sulfate, filtered and concentrated in rotavap to give the title compound (3.5 g, 15.40 mmol, 98% yield) as a white powder. No further purification was carried out.

Herkunft & Nachweise