Methyl chloroformate → Methyl 7-bromo-2-methyl-2H-indazole-3-carboxylate

関与物質

反応条件

反応手順

To a solution of 7-bromo-2-methyl-2H-indazole (6: R=Me, 1.50 g, 7.12 mmol) in 50 mL of THE at −78° C. was added a 2 M solution of lithium diisopropylamide in THF/heptane/ethylbenzene (4.3 mL, 8.6 mmol). The solution was stirred at 0-5° C. for 15 m, then rechilled to −78° C. To the solution was added methyl chloroformate (0.66 mL, 8.5 mmol) all at once, and the mixture was stirred while slowly warmed to room temperature over 19 h. The reaction was quenched with silica gel and concentrated. Column chromatography (0→20% EtOAc/hexanes) afforded of 7-bromo-2-methyl-2H-indazole-3-carboxylic acid methyl ester (35a: 1.52 g; 79%; m.p. 131-132) as a pale yellow solid.

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