Methanol → HCID 21250931, compound

Participants

Reaction Steps

To an ice bath cooled solution of 50 mL of methanol was added acetyl chloride (7.2 mL, 100 mmol). After stirring for 10 minutes 3-(1-oxoisoindolin-2-yl)-3-(3-ethoxy4-methoxyphenyl)propionic acid (6.00 g, 16.9 mmol) was added to the mixture. After 30 minutes the ice bath was removed and the reaction was monitored by HPLC ( Waters radial pak phenyl 8×100 mm column, 240 nm, 1.5 mL/min, 35/65 acetonitrile/0.1% phosphoric acid). After 4 hours the reaction had reached completion. The methanol was removed in vacuo and the resulting residue was diluted with 50 mL of methylene chloride. The mixture was extracted with aqueous sodium bicarbonate (50 mL) and brine. The organic layer was dried over sodium sulfate, filtered and concentrated in vacuo to afford a thick oil. Hexane (50 mL) and ether (5 mL) were added to the oil and the mixture stirred overnight in an open flask. An additional 25 mL of hexane were added to facilitate stirring. After 6 hours the slurry was filtered and the solid air dried and then dried in vacuo (60° C., <1 mm) to afford 5.45 g (87%) of methyl 3-(1-oxoisoindolin-2-yl)-3-(3-ethoxy-4-methoxyphenyl)propionate as a white solid: mp 78-80° C.; 1H NMR (DMSO-d6) δ7.75-7.40 (m, 4H), 7.10-6.80 (m, 3H), 5.72 (t, J=7.8 Hz, 1H), 4.51 (d, J=17.7 Hz, 1H), 4.09 (d, J=17.7 Hz, 1H), 3.97 (m, 2H), 3.73 (s, 3H), 3.55 (s, 3H), 3.24 (m, 2H), 1.30 (m, 3H); 13C NMR (DMSO-d6) δ170.8, 166.8, 148.5, 147.9, 141.6, 132.0, 131.3, 131.2, 127.8, 123.4, 122.8, 119.3, 112.2, 111.8, 63.7, 55.4, 51.5, 51.0, 46.3, 36.2, 14.6; Anal. Calcd. for C21H23NO5. Theoretical: C, 68.28; H, 6.28; N, 3.79. Found: C, 68.13; H, 6.27; N, 3.70.

Provenance & Evidence