反应详情

Compound V (5 g, 20.4 mmol) is dissolved in 150 ml anhydrous toluene. 0.5 g Novozym 435 (Candida Antarctica lipase B) (Novozymes A/S, Fluka Cat.-No. 73940) is added followed by vinylbutyrate (13 ml, 102.2 mmol). The mixture is stirred using mechanical stirrer at 21° C. After 1 day, an additional 0.5 g Novozym 435 is added. After 4 days at a conversion of 54%, the mixture is filtered and concentrated in vacuo to obtain an oil containing a mixture of (1R, 3R)-cis-6-chloro-3-phenylindan-1-ol-butyrate ester and desired compound Va with an enantiomeric excess of 99.2% (99.6% compound Va and 0.4% (1R, 3R)-cis-6-chloro-3-phenylindan-1-ol).

1. addition73940) is added
2. customat 21° C
3. additionan additional 0.5 g Novozym 435 is added
4. waitAfter 4 days at a conversion of 54%
5. filtrationthe mixture is filtered
6. concentrationconcentrated in vacuo
7. customto obtain an oil
8. additioncontaining