Isopropyl Acetate → N-(2,3-dihydro-1H-inden-2-yl)-2,2,2-trifluoroacetamide

Temperature

2.5 °C

A 1 L, 3-necked, round-bottomed flask, equipped with a mechanical stirrer, digital thermometer, cooling bath, and nitrogen inlet-outlet, was charged with 2-aminoindan, (104 g, 0.781 mole) and isopropyl acetate (200 mL) at 20-25° C. The solution was cooled to 0-5° C. Ethyl trifluoroacetate (133 g, 0.936 mol) was added over 40 minutes while maintaining the internal temperature at 0-10° C. (in a 0-5° C. bath). The thick slurry was stirred at 0-10° C. for 2 hours. The reaction mixture is warmed to 20-25° C. over 30 minutes and heptane (60 mL) was added. The slurry was stirred for 30 minutes and the solids were collected by filtration over a polypropylene filter paper in a Büchner funnel with suction. The filter cake was washed with 0.003% (w/v) Stadis-450 (4.5 mg Lot # 200 Dolder)/heptane (3×50 mL) or until the filtrate was colorless. The solids were dried at 60-65° C. under vacuum (10-30 torr) with nitrogen bleeding to obtain 149.2 g (83.4% yield) of N-(2,3-dihydro-1H-inden-2-yl)-2,2,2-trifluoroacetamide as a beige white solid.

1. customA 1 L, 3-necked, round-bottomed flask, equipped with a mechanical stirrer
2. temperaturedigital thermometer, cooling bath, and nitrogen inlet-outlet
3. temperaturewhile maintaining the internal temperature at 0-10° C. (in a 0-5° C. bath)
4. temperatureThe reaction mixture is warmed to 20-25° C. over 30 minutes
5. stirringThe slurry was stirred for 30 minutes
6. filtrationthe solids were collected by filtration over a polypropylene
7. filtrationfilter paper in a Büchner funnel with suction
8. washThe filter cake was washed with 0.003% (w/v) Stadis-450 (4.5 mg Lot # 200 Dolder)/heptane (3×50 mL)
9. customThe solids were dried at 60-65° C. under vacuum (10-30 torr) with nitrogen bleeding

ORD record

ord-9280b1117be14774bd18af5475852d93

Source dataset

uspto-grants-2005_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06933410B2