反应详情

温度

-10 °C

A suspension of 749.88 g (2187.5 mmol) (methoxymethyl)triphenylphosphonium chloride in 2.5 l THF was cooled (−10° C.) and deprotonated with 245.5 g (2187.5 mmol) potassium t-butoxide. The dark red solution was stirred at 0–5° C. for 0.5 h, cooled (−20° C.) and 457.32 g (261.33 mmol) of Methyl-(4-oxo-cyclohexyl)-carbamic acid benzyl ester in 1.25 l THF were dropped in (1.25 h). After 1.3 h at RT, the reaction was treated with 1.75 l aqueous 1M NaHCO3 and stirred for 45 min. The phases were separated, the aqueous phase was extracted with TBME (700 ml), the organic phase was dried (Na2SO4), filtered and evaporated. The residue was suspended in hexane (5 l), cooled (0° C.), filtered and evaporated to give 495.2 g (98%) of (4-Methoxymethylene-cyclohexyl)-methyl-carbamic acid benzyl ester, MS: 289 (M).

1. additionwere dropped in (1.25 h)
2. waitAfter 1.3 h at RT
3. stirringstirred for 45 min
4. customThe phases were separated
5. extractionthe aqueous phase was extracted with TBME (700 ml)
6. dry with materialthe organic phase was dried (Na2SO4)
7. filtrationfiltered
8. customevaporated
9. temperaturecooled (0° C.)
10. filtrationfiltered
11. customevaporated