[CH3:1][C:2]1[CH:9]=[CH:8][CH:7]=[C:6]([CH3:10])[C:3]=1[CH2:4]O.Cl[Si](C)(C)C.[C:16]1(=[O:26])[NH:20][C:19](=[O:21])[C:18]2=[CH:22][CH:23]=[CH:24][CH:25]=[C:17]12.[K]>CS(C)=O.CN(C=O)C.C(OCC)(=O)C.O>[CH3:1][C:2]1[CH:9]=[CH:8][CH:7]=[C:6]([CH3:10])[C:3]=1[CH2:4][N:20]1[C:16](=[O:26])[C:17]2=[CH:25][CH:24]=[CH:23][CH:22]=[C:18]2[C:19]1=[O:21]To a stirred solution of 2,6-Dimethylbenzyl Alcohol (Step A, 6.59 g, 48.4 mmol) in DMSO (20 ml) was added chlorotrimethylsilane (15.75 ml, 145 mmol) at room temperature, and the mixture was stirred for one hr. To this reaction mixture were added ethyl acetate and water, the organic layer was washed with brine, dried over Na2SO4, filtered and concentrated to give an oil. The oily residue was redissolved in DMF (100 ml) and potassium phthalimide (10.76 g, 58.1 mmol) was added. The reaction mixture was stirred for 16 hours at room temperature, ethyl acetate was added, and the organic layer was washed with 3% Na2CO3, 1 N HCl, dried over Na2SO4, filtered and concentrated to give white solid. The purification was done by flash chromatography on silica gel column (chloroform:methanol 95:5) to provide the title compound as white solid.
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