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To a solution of 2-(3-chloro-phenyl)-propane-1,2-diamine (3.4 g) and 4-oxo-adamantane-1-carboxylic acid methyl ester (CAS 56674-88-5, 3.85 g) in ethanol (50 mL) was added acetic acid (0.7 mL) and reaction mixture was refluxed for 4 h, after which it was cooled to 0° C. and NaBH4 was added. The reaction mixture was then slowly brought to room temperature and left at stirring for 17 h. The reaction was monitored by TLC. After completion, water (30 mL) was slowly added. The reaction mixture was concentrated at reduced pressure to remove the ethanol. The aqueous layer was extracted with DCM (3×50 mL) and the organic layers were then dried over Na2SO4 and then concentrated to get crude desired 4-[2-amino-2-(3-chloro-phenyl)-propylamino]-adamantane-1-carboxylic acid methyl ester (6 g) as a mixture of E/Z isomers. The compound was used in the next step without further purification. MS (ESI): 377.4 (MH+).

1. temperaturewas refluxed for 4 h
2. customwas then slowly brought to room temperature
3. waitleft
4. concentrationThe reaction mixture was concentrated at reduced pressure
5. customto remove the ethanol
6. extractionThe aqueous layer was extracted with DCM (3×50 mL)
7. dry with materialthe organic layers were then dried over Na2SO4
8. concentrationconcentrated