Methyl morpholine oxide → 7-[[(4-Formylphenyl)methyl](methylsulfonyl)amino]heptanoic acid

Participants

Reaction Steps

A solution of ethyl-7-[(4-vinyl-benzyl)-methanesulfonyl-amino]-heptanoate (2.2 g, 6.0 mmol) in dioxane (45 mL) was added to a solution of N-methylmorpholine N-oxide (1.47 g, 12.5 mmol) in water (45 mL). Osmium tetroxide (4.6 mL, 2.5 wt % in 2-methyl-2-propanol) was added and the mixture was stirred at room temperature for 1 h. The reaction was quenched with 1N HCl (50 mL) and the aqueous solution was extracted with CH2Cl2. The organic layer was washed with water (1×) followed by brine (1×), dried over MgSO4, filtered, and concentrated in vacuo. The residue was dissolved in 35% aqueous THF (100 mL) and NalO4 (1.41 g, 6.59 mmol) was added. The mixture was stirred at room temperature for 2 h and was diluted with EtOAc and water. The organic solution was washed with water (1×) followed by brine (1×), dried over MgSO4, filtered, and concentrated in vacuo to afford the title compound (1.9 g) which was used without further purification. 1H NMR (400 MHz, CDCl3) δ 10.0 (s, 1H), 7.82-7.90 (d, 1H), 7.50-7.59 (d, 2H), 5.30 (s, 2H), 4.45 (s, 2H), 4.05-4.18 (m, 2H), 3.12-3.22 (m, 2H), 2.86 (s, 3H), 2.19-2.30 (m, 2H), 1.42-1.62 (m, 6H), 1.18-1.30 (m, 3H); MS 387 (M+18).

Provenance & Evidence