Sulfuric acid magnesium salt (1:1) → HCID 18451932, compound

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A mixture of ethyl 3-[(2-amino-1-phenylethyl)amino]propanoate (6.38 g, 27.0 mmol), magnesium sulfate (10 g, 83.1 mmol), and cyclopropanecarboxaldehyde (2.02 mL, 27.2 mmol) in dichloroethane (200 mL) was adjusted to pH 6 with acetic acid. After 1 h, sodium triacetoxyborohydride (5.72 g, 27.0 mmol) was added. After an additional 30 min, saturated aqueous sodium bicarbonate was added and the mixture was extracted with dichloromethane (3×). The combined organic extracts were dried over magnesium sulfate, filtered, and concentrated. Purification by silica gel chromatography [100% dichloromethane→95% dichloromethane/5% (10% ammonium hydroxide/methanol)] gave the title compound (3.14 g). MS 291 (M+1).

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