1-Bromo-4-(1,4-dibromobutyl)benzene → (5R*,6S*)-6-(4-bromophenyl)-3-(3,5-dichlorophenyl)-4-oxo-2-thioxo-1,3-diazaspiro[4.4]nonane-1-carboxylic acid tert-butyl ester

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Using the same procedure as in Example 1 starting from 1-bromo-4-(1,4-dibromobutyl)benzene (423 mg, 1.1 mmol) (Preparation 4) and 3-(3,5-dichlorophenyl)-4-oxo-2-thioxoimidazolidine-1-carboxylic acid tert-butyl ester (361 mg, 1 mmol) (Preparation 9), (5R*,6S*)-6-(4-bromophenyl)-3-(3,5-dichlorophenyl)-4-oxo-2-thioxo-1,3-diazaspiro[4.4]nonane-1-carboxylic acid tert-butyl ester was obtained (54 mg) as a white solid. 1H NMR (CDCl3): 7.49 (2H, d, J=8.4 Hz), 7.33 (1H, m), 7.09 (2H, d, J=8.4 Hz), 6.22 (2H, m), 4.17 (1H, dd, J1=13.2 Hz, J2=5.4 Hz), 2.35-2.6 (3H, m), 2-2.35 (3H, m), 1.69 (9H, s).

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