[CH2:1]([C:8]1[CH:16]=[C:15]([O:17][CH3:18])[CH:14]=[CH:13][C:9]=1[C:10](O)=[O:11])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(Cl)(=O)C(Cl)=O.Cl.CN.[CH:28]([N:31](C(C)C)CC)(C)C>C(Cl)Cl.CN(C=O)C.CCCCCC.CCOCC>[CH2:1]([C:8]1[CH:16]=[C:15]([O:17][CH3:18])[CH:14]=[CH:13][C:9]=1[C:10]([NH:31][CH3:28])=[O:11])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1
To an ice bath cooled solution of 10 (11.8 g, 48.8 mmol) in methylene chloride under Argon was added oxalyl chloride (5.10 mL, 58.5 mmol). Added a few drops of DMF and warmed to room temperature. After 18 h the solvent was removed in vacuo. Methylene chloride and methylamine hydrochloride (6.54 g, 97.6 mmol) were added and the contents of the reaction flask were cooled in an ice bath. Diisopropylethylamine was added dropwise using an addition funnel. After 3 h the reaction solution was washed with 5% potassium bisulfate, sat. sodium bicarbonate, and brine. Dried the organic layer with sodium sulfate (anh.) and removed the solvent in vacuo. Trituration with hexane/ether gave 11 as a light solid (8.15 g, 32.0 mmol, 65.5%).
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