Cyclohexene → Ethyl 4-(4-hydroxy-2-oxopyridin-1(2H)-yl)-2-methyl-2-(methylsulfonyl)butanoate

関与物質

反応条件

反応手順

Ethyl 4-[4-(benzyloxy)-2-oxopyridin-1(2H)-yl]-2-methyl-2-(methylsulfonyl)butanoate (2.4 g, 5.9 mmol) which may be prepared by the same method disclosed in Example 51, step A, was dissolved in ethanol (100 ml) and cooled with a dry ice/acetone bath. To the cooled solution was added Pearlman's catalyst (2.0 g) and cyclohexene (9.0 ml, 88.4 mmol) then heated to 85° C. for 3 hours. The reaction mixture was cooled to RT and filtered through celite (approx 2 inches) to remove catalyst. The celite was washed with an additional 100 ml of ethanol. The filtrate was then concentrated under reduced pressure and the residue was dried under vacuum to afford a light gray solid. (1.75 g, 94%). MS (LC/MS) m/z 318.1 (M+1) 1H NMR (400 MHz, DMSO-d6) δ ppm 1.22 (t, J=7.02 Hz, 3H) 1.56 (s, 3H) 2.02-2.26 (m, 1H) 2.33-2.48 (m, 1H) 3.14 (s, 3H) 3.67-3.84 (m, 1H) 3.84-4.02 (m, 1H) 4.13 (dd, J=7.02, 4.49 Hz, 2H) 5.55 (d, J=2.54 Hz, 1H) 5.85 (dd, J=7.42, 2.54 Hz, 1H) 7.48 (d, J=7.42 Hz, 1H)

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