反应详情

The crude product of the title compound was synthesized by conducting the similar reaction to that mentioned in Example 12 (12a) using 4-isobutyl-3-methylbenzoic acid (0.12 g, 0.61 mmol) that was obtained in Example 27 (27d), 1-hydroxybenzotriazole (86 mg, 0.64 mmol), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (0.12 g, 0.64 mmol), 6-({[t-butyl(dimethyl)silyl]oxy}methyl)-N′-hydroxypyridine-3-carboximidamide (0.16 g, 0.58 mmol) that was obtained in Example 23 (23c), and tetrabutylammonium fluoride (a 1.0 M solution in tetrahydrofuran, 1.2 ml, 1.2 mmol). Subsequently, the crude product of the title compound thus obtained was purified by chromatography on a silica gel column using a mixed solvent of ethyl acetate and hexane (2:3 to 1:1) as the eluent to afford the title compound (0.19 g) in a yield of 99% as a white crystalline solid.

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