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0 °C

To a solution of 3-(1-methyl-pyridin-4-yl)-5-hydroxy-1H-indole (8.0 g, 34.7 mmol) and 1-methyl-2-pyrrolidinone (10 mL) in dichloromethane (90 mL) stirring at 0° C., was added tert-butyldimethylsilyl chloride in small portions (5.50 g, 36.5 mmol), followed by imidazole also in small portions (2.48 g, 36.5 mmol). The reaction mixture was stirred for 1 hour at 0° C., then overnight at room temperature. The mixture was concentrated in vacuo to a solid residue, which was directly purified on silica gel. Elution with a 9:1 mixture of dichloromethane and methanol provided 7.60 g (63%) of the title compound as a white solid: mp=191-195° C.; 1H NMR (400 MHz, dmso-d6): 10.46 (s, 1H), 7.02 (d, 1H, J=8.4 Hz), 6.87 (d, 1H, J=2.4 Hz), 6.74 (d, 1H, J=2.4 Hz), 6.45 (dd, 1H, J=8.6, 2.6 Hz), 2.69 (br d, 2H, J=11.2 Hz), 2.46 (tt, 1H, J=11.8, 3.6 Hz), 2.04 (s, 3H), 1.92-1.80 (m, 2H), 1.75-1.67 (m, 2H), 1.50 (qd, 2H, J=12.4, 3.6 Hz), 0.81 (s, 9H), 0.00 (s, 6H); MS (APCI): m/e 345 0.2 (M+1).

1. customovernight
2. customat room temperature
3. concentrationThe mixture was concentrated in vacuo to a solid residue, which
4. customwas directly purified on silica gel
5. washElution
6. additionwith a 9:1 mixture of dichloromethane and methanol