Thiomorpholine, 4-(2,6-difluoro-4-nitrophenyl)-, 1,1-dioxide → 4-(4-Amino-2,6-difluorophenyl)-1lambda~6~,4-thiazinane-1,1-dione

Participants

Reaction Steps

To an autoclave was added 4-(2,6-difluoro-4-nitrophenyl)thiomorpholine 1,1-dioxide (Step 2, 7.0 kg, 24 moles, 1.0 eq). Raney Nickel (1.4 kg) was activated and suspended in tetrahydrofuran (4 L), and the slurry was added to the autoclave followed by additional tetrahydrofuran (66 L). The mixture was heated at 40° C. under a 40 psi hydrogen atmosphere until the reaction was complete. The mixture was then filtered, and the filtrate was directly used in the next step. A small portion of the filtrate can be concentrated and recrystallized in isopropanol to give the title compound in pure form, 1H NMR (DMSO-d6) (δ): 6.17 (m, 2H), 5.35 (s, 2H), 3.32 (m, 4H), 3.15 (m, 4H).

Provenance & Evidence