Dimethylformamide → Pivalic acid 6-{2-[(4-chlorocarbonylmethylbenzyl)ethylamino]-4-methoxyphenyl}-5,6,7,8-tetrahydronaphthalen-2-yl ester

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To a solution of pivalic acid 6-{2-[(4-carboxymethylbenzyl)ethylamino]-4-methoxyphenyl}-5,6,7,8-tetrahydronaphthalen-2-yl ester (54 mg) in tetrahydrofuran (1.5 ml) were sequentially added N,N-dimethylformamide (in catalytic amounts) and oxalyl chloride (0.027 ml) under a nitrogen atmosphere, the solution was stirred for 30 minutes at room temperature, then the solvent was evaporated in vacuo to provide pivalic acid 6-{2-[(4-chlorocarbonylmethylbenzyl)ethylamino]-4-methoxyphenyl}-5,6,7,8-tetrahydronaphthalen-2-yl ester (74 mg). A solution of this compound (37 mg) and dimethylamine (2.0 M solution in tetrahydrofuran) (0.08 ml) in tetrahydrofuran (0.7 ml) was stirred for 30 minutes at room temperature. To a suspension of lithium aluminum hydride (76 mg) in tetrahydrofuran (2 ml) was added aluminum chloride (267 mg) on an ice bath under a nitrogen atmosphere, and the solution was stirred for 1 hour at room temperature. Among the resulting suspension, 0.5 ml was added dropwise thereto followed by stirring for 2 hours at room temperature. Tetrahydrofuran and concentrated aqueous ammonia were sequentially added thereto, the solution was filtered through celite pad, and concentrated under a nitrogen stream. A solution of the resulting residue in N,N-dimethylformamide was purified by LC-MS, and the title compound (7.1 mg) was obtained.

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