Tetrahydrofuran → 3,5-Difluoro-4-(morpholin-4-yl)aniline

Participants

Reaction Steps

A solution of 4-(2,6-difluoro-4-nitrophenyl)thiomorpholine (3.00 g, 11.5 mmol) in tetrahydrofuran (60 mL) was added to a Parr bottle containing a mixture of Raney nickel (1 g) in water (15 mL) under N2, and the reaction mixture was shaken on a Parr apparatus under a hydrogen atmosphere at 40 psi for 24 hrs. The catalyst was removed by filtration through Celite, rinsing with tetrahydrofuran and water, the filtrate was diluted with water (50 mL) and EtOAc (50 mL), and the layers were separated. The organic phase was washed with saline (25 mL), dried over anhydrous magnesium sulfate and concentrated under reduced pressure, and the resulting oil was chromatographed on a Flash 40M 90 g silica gel cartridge eluting with EtOAc/heptane (15/85). Pooling and concentration of those fractions with an Rt=0.19 by TLC (EtOAc/hexanes, 25/75) gave the title compound, mp 85-86° C.; MS (ESI+) for C10H12N2F2S m/z 231 (M+H)+.

Provenance & Evidence