Potassium Carbonate → 4-Methoxybenzyl (2RS)-2-hydroxy-2-[(3R,4R)-3-phenylacetamido-4-[(RS)-tetrahydrofuran-2-yl-carbonylmethylthio]-azetidin-2-on-1-yl]acetate

Participants

Reaction Steps

The crude thiol was dissolved in acetone (35 ml) and treated with a solution of (RS)-2-bromoacetyltetrahydrofuran (3.48 g, 18.0 mmol) in acetone (5 ml). After 10 min, potassium carbonate (1.24 g, 8.9 mmol) was added, and the mixture stirred for a further 30 min. The reaction mixture was diluted with ethyl acetate, washed successively with water (×2) and brine, dried and concentrated. The residue was flash chromatographed on silica gel eluting with 50, 70 and is 80% ethyl acetate in hexane yielding the title compound as a colourless foam (5.40 g, 55%); νmax (CH2Cl2) 3409, 1781, 1745, 1684, 1613, 1516 cm-1. [Mass spectrum +ve ion (3-nitrobenzyl alcohol, sodium acetate) MNa+ (565)].

Provenance & Evidence