1,2-Dimethoxyethane → methyl 6-((2S,4R)-1-acetyl-4-((tert-butoxycarbonyl)amino)-2-methyl-1,2,3,4-tetrahydroquinolin-6-yl)nicotinate

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Reaction Steps

In a separate vial, Tert-butyl ((2S,4R)-1-acetyl-2-methyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,2,3,4-tetrahydroquinolin-4-yl)carbamate (for a preparation see Intermediate 61) (2.2 g, 5.11 mmol), methyl 6-bromonicotinate (1.325 g, 6.13 mmol), Pd(PPh3)4 (0.591 g, 0.511 mmol) and potassium carbonate (2.120 g, 15.34 mmol) were combined in methanol (10 mL) and DME (3 mL) and heated under microwave irradiation to 100° C. for 70 mins. The two reaction mixtures were combined and partitioned between water (150 mL) and DCM (3×150 mL). The aqueous layer was acidified to pH 3 via the addition of aq. HCl and extracted with DCM (3×100 mL). The combined organic layers were dried by passing through a hydrophobic frit, and concentrated in vacuo to give crude methyl 6-((2S,4R)-1-acetyl-4-((tert-butoxycarbonyl)amino)-2-methyl-1,2,3,4-tetrahydroquinolin-6-yl)nicotinate (2.2 g) which was used directly in the next step without further purification. LCMS: (Formate, 2 min), Rt=1.06 min, MH+440.

Provenance & Evidence