Ethylene Oxide → (S)-methyl 3-((S)-2-(tert-butyldimethylsilyloxy)propoxy)-2-hydroxypropanoate

Participants

Reaction Conditions

Reaction Steps

Magnesium trifluoromethanesulfonate (1.779 g, 5.52 mmol) was added in one portion to (S)-2-(tert-butyldimethylsilyloxy)propan-1-ol (Intermediate AS4) (4.2 g, 22.06 mmol) and (S)-methyl oxirane-2-carboxylate (2.252 g, 22.06 mmol) in EtOAc (25 mL). The resulting suspension was stirred at 80° C. for 24 hours. A further 1.5 g of the oxirane was added and the reaction stirred for 4 days. The reaction mixture was diluted with EtOAc, filtered through celite and evaporated to dryness. The crude product was purified by flash silica chromatography, elution gradient 0 to 30% EtOAc in isohexane to afford the product (2.70 g, 41.8%). 1H NMR (400 MHz, CDCl3) δ 0.00 (6H, d), 0.82 (9H, s), 1.06 (3H, d), 3.04 (1H, d), 3.25-3.39 (2H, m), 3.65-3.78 (5H, m), 3.83-3.92 (1H, m), 4.19-4.27 (1H, m)

Provenance & Evidence