Ethyl Acetate → (2S,4R)-2-[2-(N-t-butoxycarbonylamino) methylthiazol-4-yl]-4-methanesulfonyloxy-1-(4-nitrobenzyloxycarbonyl)pyrrolidine

Beteiligte Stoffe

Reaktionsschritte

To a solution of (2S,4R)-2-bromoacetyl-4-methanesulfonyloxy-1-(4-nitrobenzyloxycarbonyl)pyrrolidine (20 g) in a mixture of methanol (200 ml) and dichloromethane (200 ml) was added 2-(N-t-butoxycarbonylamino)thioacetamide (20 g) at room temperature. After stirring at ambient temperature for 12 hours, the mixture was poured into ethyl acetate, washed with saturated sodium bicarbonate and brine successively. The dried organic layer was evaporated, and the obtained oil was subjected to a column chromatography on silica gel and eluted with a mixture of acetone and dichloromethane (1:5, V/V) to give (2S,4R)-2-[2-(N-t-butoxycarbonylamino)methylthiazol-4-yl]-4-methanesulfonyloxy-1-(4-nitrobenzyloxycarbonyl)pyrrolidine (9.7 g).

Herkunft & Nachweise