Isopropanol → (4aR,11bR)-2-amino-10-((7-methoxypyrido[3,2-d]pyrimidin-4-yl)amino)-3,3,11b-trimethyl-4a,5,6,11b-tetrahydro-3H-benzo[6,7]oxepino[4,5-b][1,4]thiazine 4,4-dioxide

Participants

Reaction Steps

A disposable tube was charged with tert-butyl ((4aR,11bR)-10-amino-3,3,11b-trimethyl-4,4-dioxido-4a,5,6,11b-tetrahydro-3H-benzo[6,7]oxepino[4,5-b][1,4]thiazin-2-yl)carbamate (60 mg, 0.142 mmol), 4-chloro-7-methoxypyrido[3,2-d]pyrimidine (30.5 mg, 0.156 mmol) and 2-propanol (708 μl, 0.142 mmol), followed by p-toluenesulfonic acid monohydrate (53.9 mg, 0.283 mmol). The resulting mixture was stirred from rt to 90° C. for 25 min. The reaction mixture was diluted with sat. NaHCO3 and extracted with EtOAc to yield the crude product as a yellow solid. The crude material was absorbed onto a plug of silica gel and purified by column chromatography through a Redi-Sep pre-packed silica gel column (12 g), eluting with a gradient of 20% to 35% to 50% EtOAc/MeOH/NEt3 (80/20/2) in (40% EtOAc in Heptane), to provide (4aR,11bR)-2-amino-10-((7-methoxypyrido[3,2-d]pyrimidin-4-yl)amino)-3,3,11b-trimethyl-4a,5,6,11b-tetrahydro-3H-benzo[6,7]oxepino[4,5-b][1,4]thiazine 4,4-dioxide (42 mg, 0.087 mmol, 61.4% yield) as white solid. MS m/z=483.2 (M+H).

Provenance & Evidence