Potassium hydroxy sulfite → tert-butyl ((1S,3R)-3-((3-carbamoyl-6-(5-(methylsulfinyl)-1,3,4-oxadiazol-2-yl)pyrrolo[1,2-b]pyridazin-4-yl)amino)-1,2,2-trimethylcyclopentyl)carbamate

Participants

Reaction Steps

A solution of tert-butyl ((1S,3R)-3-((3-carbamoyl-6-(5-(methylthio)-1,3,4-oxadiazol-2-yl)pyrrolo[1,2-b]pyridazin-4-yl)amino)-1,2,2-trimethylcyclopentyl)carbamate (805 mg, 1.561 mmol) in acetone (16 mL) was added oxone (1.920 g, 3.12 mmol) in water (16.00 mL) and stirred for 2 hrs. The reaction mixture was diluted with 150 mL of EtOAc which was washed with 50 mL of 10% LiCl solution, 50 mL of brine and dried over Na2SO4. Filtration and concentration yielded a crude product which was purified on silica gel column with EtOAc to give tert-butyl ((1S,3R)-3-((3-carbamoyl-6-(5-(methylsulfinyl)-1,3,4-oxadiazol-2-yl)pyrrolo[1,2-b]pyridazin-4-yl)amino)-1,2,2-trimethylcyclopentyl)carbamate (186.6 mg, 23% yield). HPLC retention time=2.993 min. LC-MS: M+1 532.3. 1H-NMR (400 MHz, methanol-d4) δ 8.30 (d, J=1.8 Hz, 1H), 8.26 (s, 1H), 7.51 (d, J=1.8 Hz, 1H), 4.50 (d, J=9.0 Hz, 1H), 3.31 (s, 3H, under MeOH peak), 2.51-2.32 (m, 1H), 2.29-2.13 (m, 1H), 2.12-1.95 (m, 1H), 1.83-1.63 (m, 1H), 1.49 (s, 3H), 1.46 (s, 9H), 1.13 (s, 3H), 1.09 (s, 3H).

Provenance & Evidence