Diisopropylethylamine → N-Methoxy-2-pyridin-2-yl-3,4-dihydroquinoline-1(2H)-carboxamide

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Reaction Steps

A solution of 2-pyridin-2-yl-1,2,3,4-tetrahydroquinoline (0.723 g, 3.44 mmol) in methylene chloride (10.3 mL) was treated with 4-nitrophenyl methoxycarbamate (0.948 g, 4.47 mmol) (Org. Process Res. Dev. 2012, 16, 109-116) followed by the dropwise addition of N,N-diisopropylethylamine (1.20 mL, 6.88 mmol), and the resulting mixture was stirred at room temperature for 1.5 h. The reaction mixture was then poured over water (25 mL) and saturated sodium bicarbonate (25 mL) and extracted with dichloromethane (2×50 mL). The combined organic layers were dried over sodium sulfate, filtered, and concentrated to give a crude oily solid. Purification by flash column chromatography (100% hexanes to 20% ethyl acetate/hexanes [the ethyl acetate contained 5% methanol]) gave the desired product (0.923 g, 95%) as a racemic mixture. LCMS calculated for C16H18N3O2 (M+H)+: m/z=284.1. found: 284.0.

Provenance & Evidence