2-(2-((Tert-butyldimethylsilyl)oxy)ethoxy)ethanol → 2-{2-[4-(4,5-Dichloro-2-fluoro-phenylamino)-6-nitro-quinazoline-7-yloxy]-ethoxy}-ethanol

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(4,5-Dichloro-2-fluoro-phenyl-(7-fluoro-6-nitro-quinazolin-4-yl)-amine (Compound 25, 0.723 grams, 1.94 mmol), 2-[2-(tert-butyl-dimethyl -silanyloxy)-ethoxy]-ethanol (Compound 28a (0.64 grams, 2.9 mmol) and potassium trimethylsilanolate (0.75 gram, 5.83 mmol) were dissolved in dry DMSO (42 ml) and the resulting mixture was stirred under nitrogen atmosphere for 5 hours at 25° C. The obtained deep crimson mixture was thereafter extracted with ethyl acetate (EtOAc) and water, and the organic phase was washed with NaHCO3 (4%) and brine, and dried over Na2SO4. The solvent was then removed under reduced pressure and the residue was purified by silica gel column chromatography, using a mixture of 2% MeOH in CH2Cl2 as eluent, to obtain Compound 29a (0.217 gram, 24% yield).

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