[CH3:1][O:2][C:3](/[CH:5]=[CH:6]/[C:7]([OH:9])=[O:8])=[O:4].Cl.CN(C)CCCN=C=NCC.O[C@@H:23]([CH3:32])[C:24]([N:26]1[CH2:31][CH2:30][O:29][CH2:28][CH2:27]1)=[O:25]>ClCCl.CN(C1C=CN=CC=1)C>[C:7]([O:9][C@@H:23]([CH3:32])[C:24]([N:26]1[CH2:31][CH2:30][O:29][CH2:28][CH2:27]1)=[O:25])(=[O:8])/[CH:6]=[CH:5]/[C:3]([O:2][CH3:1])=[O:4]Following general procedure B2, (2E)-3-(methoxycarbonyl)prop-2-enoic acid (methyl hydrogen fumarate, MHF) (0.50 g, 3.84 mmol) was activated with N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (EDAC) (0.81 g, 4.20 mmol) in 10 mL of dichloromethane (DCM) at ca. 0° C. (2S)-2-Hydroxy-1-morpholin-4-yl-propan-1-one (0.48 g, 3.07 mmol) and 4-(N,N-dimethyl)aminopyridine (DMAP) (0.40 g, 3.18 mmol) were added to the activated carboxylic acid. After work-up and isolation, and purification by silica gel flash column chromatography (Biotage) using ethyl acetate (EtOAc) and hexanes (ca. 3:2) afforded 0.42 g (51% yield) of the title compound (31) as a white solid. M.p.: 79-82° C.; 1H NMR (CD3CN, 400 MHz): δ 6.90-6.81 (m, 2H), 5.44 (q, J=6.8 Hz 1H), 3.78 (s, 3H), 3.65-3.60 (m, 4H), 3.51-3.50 (m, 4H), 1.42 (d, J=6.8 Hz 3H). MS (ESI): m/z 272.05 (M+H)+.
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