2-chloro-N-(2-methoxyethyl)acetamide → [N-(2-Methoxyethyl)carbamoyl]methyl methyl(2E)but-2-ene-1,4-dioate

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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-(2-methoxyethyl)chloroacetamide (0.69 g, 4.60 mmol) in the presence of CsHCO3 (0.89 g, 4.61 mmol) to afford 0.07 g (8% yield) of the title compound (5) as a white solid after purification by mass-guided preparative HPLC and lyophilization. 1H NMR (CDCl3, 400 MHz): δ 6.94-6.92 (m, 2H), 6.46 (br s, 1H), 4.68 (s, 2H), 3.83 (s, 3H), 3.52-3.46 (m, 4H), 3.36 (s, 3H). MS (ESI): m/z 245.98 (M+H)+.

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