Cyclopropanecarboxylic acid → Methyl 2-(3-(cyclopropanecarboxamido)-4-fluorophenyl)-3,3-dimethyl-1,2,3,4-tetrahydroquinoline-6-carboxylate

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Reaction Steps

To an ice-cold mixture of methyl 2-(4-fluoro-3-nitrophenyl)-3,3-dimethyl-1,2,3,4-tetrahydroquinoline-6-carboxylate (0.3 mmol, 1.0 eq.), cyclopropanecarboxylic acid (0.46 mmol, 1.5 eq.), N,N-diisopropylethylamine (0.6 mmol, 2.0 eq.) in dichloromethane (5 mL) was added a solution of phosphorus oxychloride (0.36 mmol, 1.2 eq.). Then the reaction mixture was stirred at room temperature for 2.5 hours. LC-MS indicated that the starting material was consumed completely. The reaction was quenched by 20 mL water extracted with ethyl acetate (20 mL×2). The combined organic layer was concentrated and the residue was purified by column chromatography (petroleum ether/ethyl acetate=3:1) to afford 105 mg of methyl 2-(3-(cyclopropanecarboxamido)-4-fluorophenyl)-3,3-dimethyl-1,2,3,4-tetrahydroquinoline-6-carboxylate as a pale yellow solid; yield: 89%. MS (ESI+APCI) M+1=397.2.

Provenance & Evidence