Acetic Acid → (+/-)-Dimethyl 2-{2-[(4-methoxybenzyl)amino]ethyl}-1,2,3,4-tetrahydronaphthalene-2,6-dicarboxylate

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Reaction Steps

A solution of (1)-dimethyl 2-(2-oxoethyl)-1,2,3,4-tetrahydronaphthalene-2,6-dicarboxylate from Step C (436 mg, 1.50 mmol), 4-methoxybenzylamine (247 mg, 1.80 mmol), and AcOH (0.206 mL, 3.60 mmol) was stirred in MeOH (10 mL) at ambient temperature for 5 min, then sodium cyanoborohydride (113 mg, 1.80 mmol) was added. After 18 h, the mixture was concentrated in vacuo, and the residue was partitioned between saturated aqueous NaHCO3 (10 mL) and CH2Cl2 (20 mL). The aqueous phase was extracted further with CH2Cl2 (10 mL), and the combined organic extracts were dried over Na2SO4, filtered, and concentrated in vacuo to give the title compound in sufficient purity for use in the next step. MS: m/z=412 (M+1).

Provenance & Evidence