[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C@H:8]2[CH2:13][CH2:12][C@H:11]([CH:14]=O)[CH2:10][CH2:9]2)=[CH:4][CH:3]=1.C(O)(=O)C.[C:20]1(=[O:31])[C:25]2[CH:26]=[CH:27][CH:28]=[CH:29][C:24]=2[C:23](=[O:30])[CH2:22][O:21]1.N1CCOCC1>O>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([C@H:8]2[CH2:9][CH2:10][C@H:11](/[CH:14]=[C:22]3\[O:21][C:20](=[O:31])[C:25]4[CH:26]=[CH:27][CH:28]=[CH:29][C:24]=4[C:23]\3=[O:30])[CH2:12][CH2:13]2)=[CH:6][CH:7]=1To the resulting stirred mixture from stage 1, at ambient temperature under argon, was added acetic acid (250 mL), 1H-2-benzopyran-1,4(3H)-dione (compound of formula (III)) (32.4 g, 200 mmol) and morpholine (17.5 mL, 200 mmol). The reaction mixture was heated to 40° C. for 4 hours then allowed to cool to ambient temperature and stir overnight. Water (250 mL) was added and the slurry stirred for 15 minutes at ambient temperature then filtered. The filter cake was washed twice with tert-butyl methyl ether (2×125 mL) and dried to give the title compound as a yellow solid (62.4 g). The material obtained was spectroscopically identical to that obtained in Stage 2, Example 3.
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