反应详情

A solution of 4-bromothiophene-3-carboxylic acid methyl ester (500 mg, 2.3 mmol, 1.0 eq.) in THF (40 mL) was combined with 4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-3,6-dihydro-2H-pyridine-1-carboxylic acid t-butyl ester (0.7 g, 2.3 mmol, 1 eq.) under nitrogen. A solution of Na2CO3 (960 mg) in water (4.5 mL) was added, followed by the addition of PdCl2(PPh3)2 (80 mg, 0.1 mmol, 0.4 eq.). The resulting solution was stirred for 18 hours while the temperature was maintained at reflux in an oil bath. The resulting solution was diluted with EtOAc (50 mL), then washed with saturated aqueous NaCl (2×100 mL). The organic layer was concentrated and the residue was applied onto a silica gel column and eluted with EtOAc/PE (1:30) to yield 4-(4-methoxycarbonylthiophen-3-yl)-3,6-dihydro-2H-pyridine-1-carboxylic acid t-butyl ester (0.4 g) as a light yellow oil.

1. temperaturewas maintained
2. temperatureat reflux in an oil bath
3. washwashed with saturated aqueous NaCl (2×100 mL)
4. concentrationThe organic layer was concentrated
5. washeluted with EtOAc/PE (1:30)