Tetrabutylammonium Fluoride → tert-Butyl {4-[(2R,3R)-3-({[5,5-dimethyl-2-(4-methylphenyl)-1,3-dioxan-2-yl]methyl}thio)-1-(4-fluorophenyl)-4-oxoazetidin-2-yl]phenoxy}acetate

Participants

Reaction Conditions

Reaction Steps

tert-Butyl (4-{(1S,2R)-2-({[5,5-dimethyl-2-(4-methylphenyl)-1,3-dioxan-2-yl]methyl}thio)-1-[(4-fluorophenyl)amino]-3-oxo-3-[(4S)-2-oxo-4-phenyl-1,3-oxazolidin-3-yl]propyl}phenoxy)acetate (2.55 g, 3.25 mmol) was dissolved in dry toluene (250 ml) and heated to 90° C. under inert atmosphere. N,O-Bis(trimethylsilyl)acetamide (BSA, 2.38 ml, 9.75 mmol) was added and the mixture was stirred at 90° C. for one hour. The mixture was cooled to 45° C. and tetrabutylammonium fluoride (TBAF, 0.25 g) was added and the mixture was stirred at 45° C. for one hour. The mixture was concentrated under reduced pressure and purified by flash-chromatography (hexane:EtOAc 6:1). This afforded 1.06 g (52%) of the title compound as a white solid. 1H-NMR (CDCl3, 200 MHz): δ 0.6 (s, 3H), 1.3 (s, 3H), 1.5 (s, 9H), 2.4 (s, 3H), 3.0-3.2 (m, 2H), 3.3-3.5 (m, 4H), 3.9 (d, 1H), 4.5 (s, 2H), 4.8 (d, 1H), 6.8-7.0 (m, 6H), 7.1-7.4 (m, 6H).

Provenance & Evidence