[CH2:1]([N:8]([CH2:12][C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)[CH2:9][CH2:10]O)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C1CCCCC1.S(Br)([Br:27])=O.C(=O)([O-])O.[Na+]>CN(C=O)C>[CH2:1]([N:8]([CH2:12][C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)[CH2:9][CH2:10][Br:27])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1To N,N-dibenzyl-2-aminoethanol (80.68 g) were added cyclohexane (500 ml) and DMF (12.9 ml), and thereto was added dropwise thionyl bromide (83.4 g). The mixture was stirred for 15 hours, and to the reaction solution was added an saturated aqueous sodium hydrogen carbonate solution in an ice-bath, and the mixture was extracted with ethyl acetate. The organic layer was washed with water (three times) and saturated aqueous sodium chloride solution, dried over sodium sulfate, filtered and concentrated under reduced pressure to give the title compound (72.1 g).
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