In a manner similar to the method described in example 1b, 2-[2-(tert-butyl-dimethyl-silanyloxy)-ethoxy]-5-cyclopropyl-benzaldehyde (3.36 g, 10.5 mmol) prepared in example 130b was used as the starting material in place of 3-chloro-benzaldehyde to react with 1,1,1,3,3,3-hexamethyldisilazane (2.18 mL, 10.5 mmol), n-butyllithium (2.5 M, 4.2 mL, 10.5 mmol), trimethylsilyl chloride (1.33 mL, 10.5 mmol), triethylamine (1.9 mL, 13.6 mmol) and acetyl chloride (0.97 mL, 13.6 mmol) to give 1-{2-[2-(tert-butyl-dimethyl-silanyloxy)-ethoxy]-5-cyclopropyl-phenyl}-3-trimethylsilyoxy-2-aza-1,3-butadiene as a yellow gum and used for the next step without further purification.
