[CH3:1][O:2][CH2:3][C@@H:4]1[N:8]([C:9]([O:11][CH2:12][C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=2)=[O:10])[CH2:7][C@@H:6](S(C2C=CC(C)=CC=2)(=O)=O)[CH2:5]1.C1OCCOCCOCCOCCOCCOC1.[C-:47]#[N:48].[K+]>CS(C)=O.O>[CH3:1][O:2][CH2:3][C@H:4]1[N:8]([C:9]([O:11][CH2:12][C:13]2[CH:14]=[CH:15][CH:16]=[CH:17][CH:18]=2)=[O:10])[CH2:7][C@@H:6]([C:47]#[N:48])[CH2:5]15 (13.76 g, 0.034 mol) was dissolved in DMSO (17 mL). 18-Crown-6 (5 eq) and finely ground KCN (5 eq) were added and the reaction mixture was stirred for 6 h at 80° C. The reaction solution was diluted with H2O (17 mL) and then extracted with ethyl acetate. The organic solution was dried over MgSO4 and concentrated. The crude product was purified by column chromatography eluting with hexanes/ethyl acetate (4/1, v/v) to afford 13.76 g (69% yield) of the desired product 6 as a colorless oil.
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