C(OC(=O)[NH:7][C@H:8]1[CH2:13][CH2:12][C@H:11]([CH2:14][CH2:15][CH2:16][CH2:17][CH2:18][Br:19])[CH2:10][CH2:9]1)(C)(C)C.CO.Br.C(Br)(=O)C>C1(C)C=CC=CC=1>[Br:19][CH2:18][CH2:17][CH2:16][CH2:15][CH2:14][C@H:11]1[CH2:10][CH2:9][C@H:8]([NH2:7])[CH2:13][CH2:12]1At 0° C., a solution of 4.4 g (12.63 mmol) of trans-[4-(5-Bromo-pentyl)-cyclohexyl]-carbamic acid tert-butyl ester were received in 9 m MeOH was added to 40 ml of a HBr solution in MeOH (made by dropping at 0° C., 4.7 ml (63.07 mmol) of acetylbromide to 35 ml MeOH). The suspension was stirred for 16 h at RT, diluted with toluene and evaporated (2×). The residue was suspended in EtOAc (40 ml) cooled (−10 to −15° C.) and filtered to give 4.05 g (97%) of trans-4-(5-Bromo-pentyl)-cyclohexylamine as hydrobromide salt, MS: 248 (MH+, 1Br).
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