反应详情

Following general procedure A, methyl hydrogen fumarate (MHF) (0.68 g, 5.26 mmol) dissolved in NMP was reacted at ca. 55° C. with tert-butyl 2-(2-chloroacetylamino) acetate (0.91 g, 4.38 mmol) in the presence of CsHCO3 (1.19 g, 6.13 mmol) of the tert-butyl-protected intermediate and then purified by silica gel column chromatography (Biotage) using a mixture of ethyl acetate (EtOAc) and hexanes (1:2 to 2:3 to 1:1) as eluent. The purified product was treated with 50% trifluoroacetic acid (TFA) in dichloromethane (DCM). Removal of solvents afforded 0.13 g (12% yield) of the title compound (6). 1H NMR (CD3OD, 400 MHz): δ 6.96-6.93 (m, 2H), 4.74 (s, 2H), 3.98-3.95 (m, 2H), 3.81 (s, 3H). MS (ESI): m/z 246.00 (M+H)+, 244.02 (M−H)−.

1. custompurified by silica gel column chromatography (Biotage)
2. additiona mixture of ethyl acetate (EtOAc) and hexanes (1:2 to 2:3 to 1:1) as eluent
3. additionThe purified product was treated with 50% trifluoroacetic acid (TFA) in dichloromethane (DCM)
4. customRemoval of solvents