反应详情

温度

30 °C

Amine 12 (600 mg, 3.3 mmol) was dissolved in 40 ml of methyl-tert-butyl-ether. 1 ml of ethyl-metoxyacetate and 5.0 g of Novozym 435 were added, and all was stirred for 120 h on 30° C. Reaction was followed by HPLC analysis on the Chiralcel OD column (250×4.6 mm) with hexane:t-BuOH:dimethylamine=92:8:0.2 (1 ml/min, 254 nm, tR(S)=15.31 min, tR(R)=18.28 min) as the mobile phase. The enzyme was separated from the reaction mixture by filtration and the filtrate was evaporated to oil remain which was dispersed in 10 ml of 1 M HCl and extracted twice with 20 ml of dichloromethane. The aqueous layer was alkalified with a solid sodium carbonate to pH=8 and extracted three times with 20 ml of diethyl-ether. Organic layers were combined and dried over anhydrous sodium sulphate. After filtration and solvent removal, S-12 as yellow oil (267 mg; 89%) was yielded. According to HPLC analysis ee>99%. [α]D25=−46 (c=0.05 M, CHCl3).

1. customReaction
2. customThe enzyme was separated from the reaction mixture by filtration
3. customthe filtrate was evaporated to oil
4. additionwas dispersed in 10 ml of 1 M HCl
5. extractionextracted twice with 20 ml of dichloromethane
6. extractionextracted three times with 20 ml of diethyl-ether
7. dry with materialdried over anhydrous sodium sulphate
8. filtrationAfter filtration and solvent removal, S-12 as yellow oil (267 mg; 89%)
9. customwas yielded