CC(OI1(OC(C)=O)(OC(C)=O)OC(=O)C2C=CC=CC1=2)=O.[CH3:23][O:24][C:25]1[CH:34]=[C:33]2[C:28]([N:29]=[CH:30][C:31]([S:35][CH2:36][CH2:37][OH:38])=[N:32]2)=[CH:27][CH:26]=1.S([O-])([O-])(=O)=S.[Na+].[Na+].C(=O)([O-])O.[Na+]>ClCCl.CCCCCC.C(OCC)(=O)C>[CH3:23][O:24][C:25]1[CH:34]=[C:33]2[C:28]([N:29]=[CH:30][C:31]([S:35][CH2:36][CH:37]=[O:38])=[N:32]2)=[CH:27][CH:26]=1Dess-Martin periodinane (10.8 g, 25.4 mmol, 2.0 eq) is added at 0° C. to a stirred solution of 2-(7-methoxy-quinoxalin-2-ylsulfanyl)-ethanol (3.0 g, 12.7 mmol, 1.0 eq) in dichloromethane (100 mL). The reaction mixture is stirred 0° C. for 30 minutes then at room temperature for 3 hours. Then a saturated sodium thiosulfate aqueous solution (50 mL) is added, followed by a saturated sodium hydrogen carbonate aqueous solution (50 mL). The resulting mixture is stirred for 30 minutes, then extracted with dichloromethane (3×100 mL). The combined organic layers are dried over sodium sulfate, filtered and concentrated to give a crude product that is purified by column chromatography (silica gel, eluent: ethyl acetate:hexane, 1:5, v/v) to afford (7-methoxy-quinoxalin-2-ylsulfanyl)-acetaldehyde as a yellow oil (2.22 g, 75% yield).
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