tert-Butyl methyl ether → Cis-2-(4-Fluoro-Phenyl)-Cyclopropyl-Carbamic Acid Tert-Butyl Ester

関与物質

反応手順

4-Fluorophenyl benzaldehyde-tosylhydrazone sodium salt (786 mg, 2.5 mmol), N-vinyl-carbamic acid tert-butyl ester (1.432 g, 10 mmol) and benzyltriethylammonium chloride (57 mg, 0.25 mmol) were covered with dioxane (11 ml) under argon. Rh2(OAc)4 (11 mg, 0.025 mmol) was added and the suspension stirred at room temperature for 15 minutes. The slurry became thick and difficult to stir so a further 4 ml of dioxane was added. The mixture was stirred at 75° C. for 2 hours, then shaken between tBuOMe and water. The organic phase was washed with water and NaCl (satd), dried over MgSO4 and evaporated to yield a brown viscous oil (1.353 g), which was chromatographed on silica to yield 2-(4-fluoro-phenyl)-cyclopropyl-carbamic acid tert-butyl ester 369 mg (59%, m.p. 117-118° C.) cis and 125 mg (20% m.p. 102-105° C.) trans.

情報源と証拠