3-(Methoxycarbonyl)-1,2,2-trimethylcyclopentane-1-carboxylic acid → HCID 178441264, Verbindung

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a 20-mL scintillation vial containing a magnetic stir bar were added the product from Example 92B (637 mg, 3.00 mmol), racemic 3-(methoxycarbonyl)-1,2,2-trimethylcyclopentanecarboxylic acid (Maybridge, 771 mg, 3.60 mmol), and 2-(1H-benzo[d][1,2,3]triazol-1-yl)-1,1,3,3-tetramethylisouronium tetrafluoroborate (TBTU, Bachem, 1.16 g, 3.60 mmol). Anhydrous acetontirile (8 mL) was added to form a white slurry. Neat triethylamine (Aldrich, 1.09 g, 10.8 mm01) was added via syringe to form a tan solution. The reaction flask was heated to 60° C. in a shaker block and mixed for 2 hours. The volatiles were removed by rotary evaporator to give a brown oil. The product was purified by flash chromatography (silica gel: 2-20% ethyl acetate in hexanes) to afford the title compound. 1H NMR (DMSO-d6) δ 0.50 (s, 3H), 0.90 (t, J=7.5 Hz, 3H), 1.21 (s, 3H), 1.24-1.36 (m, 2H), 1.30 (s, 3H), 1.41-1.51 (m, 1H), 1.57 (s, 9H), 1.57-1.67 (m, 2H), 1.73-1.87 (m, 1H), 2.01-2.11 (m, 1H), 2.62-2.67 (m, 2H), 2.70-2.81 (m, 1H), 2.85-2.91 (m, 1H), 3.60 (s, 3H), 8.50 (s, 1H). MS (ESI+) m/z 409 (M+H)+. Anal. calcd. for C22H36N2O3S: C, 64.67; H, 8.88; N, 6.86. Found: C, 64.20; H, 8.71; N, 6.59.

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