S1[CH:5]=[CH:4][CH:3]=[C:2]1[CH2:6][NH:7][CH2:8][CH2:9][C:10]([O:12][CH3:13])=[O:11].Cl.NCCC(OC)=[O:19].C(=O)C1OC=CC=1>>[O:19]1[CH:5]=[CH:4][CH:3]=[C:2]1[CH2:6][NH:7][CH2:8][CH2:9][C:10]([O:12][CH3:13])=[O:11]Methyl 3-[(2-furanylmethyl)amino]propanoate (22) was prepared in the manner methyl 3-[(2-thienylmethyl)amino]propanoate (15) was prepared, as described above in Example 15, on a 6.5 mmol scale from methyl β-alaninate hydrochloride and furfural to yield 0.28 g (28%) of product.
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