Trifluoroacetic acid → HCID 73506446, compound

Participants

Reaction Steps

To a stirred solution of trifluoroacetic acid salt of 5′-(5-(3,5-dichloro-4-fluorophenyl)-5-(trifluoromethyl)-1,4,2-dioxazol-3-yl)-3′H-spiro[azetidine-3,1′-isobenzofuran](Preparation 45, 0.3 g, 0.648 mmol, 1 eq) in DMF (5 mL) was added triethyl amine (0.727 mL, 5.181mmol, 8 eq), followed by addition of EDC.HCl (0.185 g, 0.971 mmol, 1.5 eq), HOBt (0.087 g, 0.648 mmol, 1 eq) and methane sulfonyl acetic acid (0.178 g, 1.295 mmol, 2 eq) at room temperature. Resulting reaction mixture was stirred at room temperature for 18 hours under nitrogen atmosphere. After complete consumption of starting material, reaction mixture was quenched by water (50 mL) and extracted with ethyl acetate (3×30 mL). Combined organic phase was washed with saturated solution of LiCl solution (30 mL), brine (30 mL), dried over anhydrous Na2SO4 and concentrated under reduced pressure to get brown thick oil (0.48 g, crude). Crude was purified by combiflash using 40 g Redisep column. Desired compound was eluted in 52% ethyl acetate in hexane to afford title compound as off white solid (0.228 g, 60.35%). 1H NMR (400 MHz, CDCl3) δ: 3.19 (s, 3H), 3.86 (s, 2H), 4.35 (d, J=11.16 Hz, 1H), 4.45 (d, J=11.16 Hz, 1H), 4.67 (t, J=10.72 Hz, 2H), 5.19 (s, 2H), 7.63-7.66 (m, 3H), 7.70 (s, 1H), 7.89 (d, J=8.08 Hz, 1H). (m/z): 580.9 (M−H), HPLC Purity: 95.78%.

Provenance & Evidence