Sodium Chloride → 2-[4-Cyano-4-(3-cyclopentyloxy-4-methoxyphenyl)cyclohexylidene]-1,3-dithiane

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a solution of 2-trimethylsilyl-1,3-dithiane (9.25 mL, 48.7 mmol) in dry tetrahydrofuran (80 mL) at 0°C. under an argon atmosphere was added rapidly n-butyllithium (2.5M in hexanes, 19.2 mL, 48 mmol). After 10 min, the mixture was cooled to -78°C. and a solution of 4-cyano-4-(3-cyclopentyloxy-4-methoxyphenyl)cyclohexan-1-one (7.53 g, 23 mmol) in tetrahydrofuran (40 mL) was added. After 10 min, aqueous sodium chloride was added, the mixture was allowed to warm to room temperature and was diluted with water. This mixture was combined with the product of three substantially similar reactions conducted on ketone (3.04, 6.01 and 6.1 g, 48.3 mmol total), the combined mixture was extracted three times with methylene chloride, the extract was dried (magnesium sulfate) and evaporated. Purification by flash chromatography, eluting with 10% ethyl acetate/hexanes, provided a white solid (26 g, 87%): m.p. 115°-116° C.

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