[CH2:1]([NH2:3])[CH3:2].CO.[S:6](Cl)([C:9]1[CH:17]=[CH:16][C:12]([N+:13]([O-:15])=[O:14])=[CH:11][CH:10]=1)(=[O:8])=[O:7]>O>[CH2:1]([NH:3][S:6]([C:9]1[CH:10]=[CH:11][C:12]([N+:13]([O-:15])=[O:14])=[CH:16][CH:17]=1)(=[O:7])=[O:8])[CH3:2]To a 40-mL vial with magnetic stir bar at 25° C. was added the Ethylamine solution (0.91 g, 20 mmol, 1.3 mL, 70% w/v in water, 4.5 eq.) and methanol (5 mL). The reaction vial was cooled to 0° C. The Nosyl chloride (1.0 g, 4.5 mmol, 1 eq.) was added portion-wise keeping the temperature between 0-5° C. and stirring continued ×15 min. after addition was complete. Water (10 mL) was then added. A precipitate began to form immediately. Stirring was continued at 0° C.×30 minutes. The material was collected by filtration, rinsed with water, and dried thoroughly in vacuo to afford 827 mg (79% yield). LCMS (ESI) 231 (M+H); 229 (M−H).
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