Sodium Iodide → HCID 20605706, compound

Participants

Reaction Steps

To a solution of 4-oxo-4,5,6,7-tetrahydro-indole-1,3-dicarboxylic acid 1-tert-butyl ester 3-methyl ester (1.10 g, 3.74 mmol), NaI (841 mg, 5.61 mmol) and triethylamine (1.56 mL, 11.22 mmol) in CH3CN (15 mL), is added trimethylsilyl chloride (0.707 mL, 5.61 mmol) via syringe. The reaction mixture is stirred at room temperature for 15 h., 30 mL of ethyl acetate/hexanes (1:1 with a few drops of triethylamine) is added to dilute the solution. Saturated sodium bicarbonate solution (20 mL) is added. The layers are separated and the aqueous phase is extracted with ethyl acetate/hexanes (1:1) (3×10 mL). The combined organic layers are dried (Na2SO4) and evaporated to provide 4-trimethylsilanyloxy-6,7-dihydro-indole-1,3-dicarboxylic acid 1-tert-butyl ester 3-methyl ester (1.3 g, 100%) as a viscous red oil. 1H NMR (400 MHz, CDCl3) δ0.180 (9H, s), 1.576 (9H, s), 2.343 (2H, m), 2.930 (2H, t), 3.781 (3H, s), 4.826 (1H, t), 7.580 (1H, s). MS (ES+) 366 (M+1)

Provenance & Evidence