[CH3:1][O:2][C:3](=[O:11])[C:4]1[CH:9]=[CH:8][CH:7]=[C:6]([NH2:10])[CH:5]=1.[C:12](Cl)(=[O:17])[CH2:13][CH2:14][CH:15]=[CH2:16].C(O)(=O)CCC=C.S(Cl)(Cl)=O>C(Cl)Cl.N1C=CC=CC=1>[C:12]([NH:10][C:6]1[CH:5]=[C:4]([CH:9]=[CH:8][CH:7]=1)[C:3]([O:2][CH3:1])=[O:11])(=[O:17])[CH2:13][CH2:14][CH:15]=[CH2:16]
Methyl(3-amino)benzoate (4.5 g, 29.8 mmol) was taken up in DCM (10 ml) and pyridine (1 ml) at 0° C. 4-Pentenoyl chloride (freshly prepared from 4-pentenoic acid (3.0 g, 29.97 mmol) and thionyl chloride (6.6 ml) at r.t. for 1 h, evaporated and azeotroped with DCM) was added dropwise in DCM (3 ml). The mixture was allowed to warm to r.t. and stirred overnight. The mixture was evaporated and partitioned between EtOAc and 1M HCl. The organic portion was washed with 5% KHCO3 and brine, filtered (Whatman® 1PS, phase separator), and evaporated. The residue was chromatographed (eluant 30% EtOAc in hexanes) to provide a colourless oil (2.20 g, 32%).
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