[C:1]([O:8][CH3:9])(=[O:7])/[CH:2]=[CH:3]/[C:4]([OH:6])=[O:5].[CH2:10]([NH:14][C:15](=[O:18])[CH2:16]Cl)[CH2:11][CH2:12][CH3:13].C(=O)([O-])O.[Cs+]>CN1C(=O)CCC1>[C:4]([O:6][CH2:16][C:15](=[O:18])[NH:14][CH2:10][CH2:11][CH2:12][CH3:13])(=[O:5])/[CH:3]=[CH:2]/[C:1]([O:8][CH3:9])=[O:7]Following general procedure A, methyl hydrogen fumarate (MHF) (0.50 g, 3.84 mmol) dissolved in NMP was reacted at ca. 55° C. with N-butyl chloroacetamide (0.69 g, 4.61 mmol) in the presence of CsHCO3 (0.89 g, 4.61 mmol) to afford 0.19 g (21% yield) of the title compound (4) as a white solid after purification by mass-guided preparative HPLC and lyophilization. 1H NMR (CDCl3, 400 MHz): δ 6.98-6.92 (m, 2H), 6.09 (br s, 1H), 4.68 (s, 2H), 3.82 (s, 3H), 3.34-3.29 (q, 2H, J=6.4 Hz), 1.54-1.48 (m, 2H), 1.38-1.32 (m, 2H), 0.956-0.920 (t, J=7.6 Hz, 3H). MS (ESI): m/z 244.04 (M+H)+.
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