[CH2:1]([NH:8][C@H:9]1[CH2:14][CH2:13][CH2:12][CH2:11][C@@H:10]1[NH2:15])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[H-].[Na+].FC(F)(F)S([O-])(=O)=O.Br[CH2:27][CH2:28][S+](C1C=CC=CC=1)C1C=CC=CC=1.[Cl-].[NH4+]>C(Cl)Cl>[CH2:1]([N:8]1[C@@H:9]2[C@H:10]([CH2:11][CH2:12][CH2:13][CH2:14]2)[NH:15][CH2:28][CH2:27]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1The obtained (1S,2S)-N-benzylcyclohexane-1,2-diamine (2.90 g, 14.2 mmol) was dissolved in methylene chloride (284 nL). To the solution, 60% sodium hydride (1.99 g, 49.7 mmol) was added with ice-cooling and stirring in a nitrogen atmosphere. After 5 minutes, (2-bromoethyl)diphenylsulfonium trifluoromethanesulfonate (6.92 g, 15.6 mmol) was added to the reaction mixture with ice-cooling and stirring, and the mixture was stirred overnight at room temperature. To the reaction mixture, a saturated aqueous solution of ammonium chloride was added dropwise in small portions, and the product was then extracted twice with methylene chloride (100 mL). The organic layers were combined and dried over magnesium sulfate, and the solvent was then distilled off under reduced pressure. The obtained residue was purified by NH-silica gel column chromatography (ethyl acetate/hexane) to obtain (4aS,8aS)-1-benzyldecahydroquinoxaline (2.28 g, 70%) in a light brown solid form.
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