3-[bis(methylsulfanyl)methylene]-1-isopentyl-2,4(1H,3H)-pyridinedione → 3-(7-amino-1,1-dioxido-4H-1,2,4-benzothiadiazin-3-yl)-4-hydroxy-1-isopentyl-2(1H)-pyridinone

Participants

Reaction Conditions

Reaction Steps

The product of Example 457C (2.08 g, 7.29 mmol) was treated with the product of Example 414A (2.00 g, 6.96 mmol) in dioxane (20 mL) at 115° C. for 30 minutes, cooled to 25° C. and concentrated under reduced pressure. A solution of the residue in 4M hydrochloric acid in dioxane (20 mL) was stirred at 25° C. for 18 hours and concentrated under reduced pressure. The residue was triturated with dichloromethane and filtered to give the title compound. The filtrate containing the protected intermediate was concentrated and purified by chromatography on silica gel eluting with 1% methanol in dichloromethane. The protected product was re-subjected to the above deprotection conditions to provide the title compound as its hydrochloride salt (2.02 g, 96%). 1H NMR (300 MHz, DMSO-d6) δ 0.92 (s, 3 H) 0.94 (s, 3 H) 1.58 (m, 3 H) 3.99 (m, 2 H) 6.31 (d, J=7.35 Hz, 1 H) 6.96 (m, 2 H) 7.34 (d, J=8.46 Hz, 1 H) 8.04 (d, J=7.35 Hz, 1 H) 14.04 (s, 1 H) 14.19 (s, 1 H). MS (ESI−) m/z 375 (M−H)−.

Provenance & Evidence