Yield:913983-25-2 98.2%

Reaction Conditions:

Stage #1: 3-iodo-1H-pyrrolo[2,3-b]pyridinewith sodium hydride in N,N-dimethyl-formamide; for 0.333333 h;
Stage #2: triisopropylsilyl chloride in N,N-dimethyl-formamide; for 1.5 h;

Steps:

11.1

Step 1-Preparation of 3-Iodo-1-triisopropylsilanyl-1H-pyrrolo[1,3-b]pyridine (37)3-Iodo-1H-pyrrolo[2,3-b]pyridine 36 (2.00 g, 8.20 mmol) was dissolved in N,N-dimethylformamide (50 mL). Sodium hydride (60% dispersion in mineral oil, 390 mg, 9.8 mmol) was added. After 20 minutes, triisopropylsilyl chloride (1.74 mL, 8.20 mmol) was added dropwise. After 1.5 hours, the reaction was poured into water and extracted with ethyl acetate, washed with saturated sodium bicarbonate and brine. The organic portions were dried over anhydrous sodium sulfate and concentrated. Purification by silica gel chromatography, 0-25% gradient ethyl acetate hexane gave compound 37 as a white solid (3.224 g, 98.2%). ¹H-NMR was consistent with the desired compound.

References:

US2008/167338,2008,A1 Location in patent:Page/Page column 40