Morpholine → (3R,4S)-4-(4-bromo-2-hydroxyphenyl)-3-[(3S)-3-{[tert-butyl(dimethyl)silyl]oxy}-3-(4-fluorophenyl)propyl]-1-phenylazetidin-2-one

Participants

Reaction Steps

(3R,4S)-4-[2-(Allyloxy)-4-bromophenyl]-3-[(3S)-3-{[tert-butyl(dimethyl)silyl]oxy}-3-(4-fluorophenyl)propyl]-1-phenylazetidin-2-one (1.34 g, 2.15 mmol) was dissolved in deoxygenated tetrahydrofuran (20 mL). Morpholine (1.8 mL, 1.8 g, 20.6 mmol) was added with additional deoxygenated tetrahydrofuran (5 mL). The reaction was purged with nitrogen and tetrakis(triphenylphosphine)palladium(0) (220 mg, 0.19 mmol) was added. The reaction was purged with nitrogen again. After 1.5 h at room temperature the reaction was diluted with ethyl acetate, washed twice with 1 N hydrochloric acid, saturated sodium bicarbonate solution, water and brine, dried over sodium sulfate and filtered. The solution was treated with activated charcoal, filtered, concentrated and purified by chromatography (40 g silica gel, 6% to 80% ethyl acetate-hexane) to afford (3R,4S)-4-(4-bromo-2-hydroxyphenyl)-3-[(3S)-3-{[tert-butyl(dimethyl)silyl]oxy}-3-(4-fluorophenyl)propyl]-1-phenylazetidin-2-one (1.04 g, 83% yield); Rf 0.38 (1:4 ethyl acetate-hexane); 1H NMR (300 MHz, CDCl3) δ 7.28-7.18 (m, 6H), 7.09-6.92 (m, 6H), 5.91 (s, 1H), 4.93 (d, J=2.3 Hz, 1H), 4.65 (t, J=5.4 Hz, 1H), 3.06 (ddd, J=4.8, 2.3, 2.3 Hz, 1H), 1.98-1.77 (m, 4H), 0.86 (s, 9H), 0.006 (s, 3H), −0.16 (s, 3H) ppm; MS [M−H]+581.7.

Provenance & Evidence