Sulfuric acid magnesium salt (1:1) → 5-((4aR,8aS)-3,3-dimethyldecahydroquinoxalin-1-yl)-1-methyl-1H-indole-2-carbonitrile

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Reaction Steps

A toluene (4 ml) suspension of (4aS,8aR)-2,2-dimethyldecahydroquinoxaline (168 mg, 0.998 mmol), 5-bromo-1-methyl-1H-indole-2-carbonitrile (259 mg, 1.10 mmol), Pd(OAc)2 (11.2 mg, 0.0499 mmol), t-Bu3P.HBF4 (14.5 mg, 0.0500 mmol), and NaOt-Bu (135 mg, 1.40 mmol) was stirred for 4 hours under reflux in a nitrogen atmosphere. The reaction solution was cooled to room temperature. Then, water (0.5 mL) and AcOEt (10 mL) were added thereto, and the mixture was stirred. MgSO4 was further added thereto, and the mixture was stirred. Insoluble matter was filtered through celite, and the residue was washed with CH2Cl2:MeOH (3:1) (5 mL×2). Then, the filtrate was concentrated under reduced pressure. The obtained residue was purified by basic silica gel column chromatography (Hex-AcOEt) to obtain a colorless oil. This oil was crystallized from hexane (1 mL) to obtain 5-((4aR,8aS)-3,3-dimethyldecahydroquinoxalin-1-yl)-1-methyl-1H-indole-2-carbonitrile (148 mg, yield: 46%) in a pale yellow powder form.

Provenance & Evidence