Lithium Hexamethyldisilazide → 7-{1-[2-(4-methoxycarbonyl-phenyl)-vinyl]-hexyl}-4,4-dimethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid tert-butyl ester

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Reaction Conditions

Reaction Steps

A solution of 4-(dimethoxyphosphorylmethyl)-benzoic acid methyl ester (0.94 g, 3.6 mmole) in 10 mL of THF at −20° C., was treated with 3.7 mL of 1M lithium bis(trimethylsilyl)amide solution in hexanes. After 20 minutes at −20° C. a solution of 7-(1-formyl-hexyl)-4,4-dimethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid tert-butyl ester (0.91 g, 2.4 mmole) in 5 mL of THF was added. The reaction mixture was stirred at −20° C. for 30 minutes, at room temperature for 6 hours, quenched by the addition of 10 mL of saturated aqueous ammonium chloride solution and extracted with three 10 mL portions of ethyl acetate. The combined organic extracts were dried over MgSO4, filtered and concentrated in vacuo to give a yellow oil. The product was purified by flash chromatography (SiO2, 5% ethyl acetate in hexanes) to yield 0.98 g of 7-{1-[2-(4-methoxycarbonyl-phenyl)-vinyl]-hexyl}-4,4-dimethyl-3,4-dihydro-2H-quinoline-1-carboxylic acid tert-butyl ester as a pale yellow oil.

Provenance & Evidence