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FIG. 11 illustrates the synthesis of Mass Tag (2). 4-Amino-benzylamine (Aldrich, 1 mmol), N-succinimidyl iodoacetate (Pierce, 1 mmol), and N,N-diisopropyl ethylamine (DIEA, 100 μL) were mixed in dichloromethane (10 mL) and stirred at room temperature for 1 hr. Solvent was removed under reduced pressure. The product was purified by silica gel column chromatography, eluting with hexane, ethyl acetate (20%-60%), to give 4-amino-N-iodoacetylbenzylamine (62.2% yield). 1H NMR (MeOD): 7.1 (d, 2H), 6.75 (d, 2H), 4.21 (s, 2H), 3.65 (s, 2H). [M+H]+ in MS: 291.0, calculated; 291.0, found.

1. customSolvent was removed under reduced pressure
2. customThe product was purified by silica gel column chromatography
3. washeluting with hexane, ethyl acetate (20%-60%)