反应详情

A mixture of N-(4-chlorobenzyl)-4-hydroxy-1-benzothiophene-5-carboxamide (Preparation 14, 0.15 g), 4-methylenemorpholin-4-ium chloride (0.13 g), and anhydrous acetonitrile (5 mL) is heated at reflux for 2 hours. Upon cooling, a saturated solution of sodium bicarbonate is added until the pH=9 and this solution is partitioned between ethyl acetate (50 mL) and water (50 mL). The organic layer is washed with brine, dried over Na2SO4, filtered, and concentrated to give a pink oil. Chromatography on a Biotage column eluting with 20% ethyl acetate in heptane (250 mL) and 50% ethyl acetate in heptane (500 mL) affords 140 mg (76%) of the title compound as a white solid. Physical characteristics: Mp 200° C.; MS (ESI+) for C21H21ClN2O3S m/z 417 (M+H)+.

1. temperatureis heated
2. temperatureat reflux for 2 hours
3. temperatureUpon cooling
4. customthis solution is partitioned between ethyl acetate (50 mL) and water (50 mL)
5. washThe organic layer is washed with brine
6. dry with materialdried over Na2SO4
7. filtrationfiltered
8. concentrationconcentrated
9. customto give a pink oil
10. washChromatography on a Biotage column eluting with 20% ethyl acetate in heptane (250 mL) and 50% ethyl acetate in heptane (500 mL)