Vinyl butyrate → (1S,3S)-6-chloro-3-phenylindan-1-ol
Reaction equation
[Cl:1][C:2]1[CH:10]=[C:9]2[C:5]([C@@H:6]([C:12]3[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=3)[CH2:7][C@H:8]2[OH:11])=[CH:4][CH:3]=1.C(OC(=O)CCC)=C>C1(C)C=CC=CC=1>[Cl:1][C:2]1[CH:10]=[C:9]2[C:5]([C@H:6]([C:12]3[CH:13]=[CH:14][CH:15]=[CH:16][CH:17]=3)[CH2:7][C@@H:8]2[OH:11])=[CH:4][CH:3]=1Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
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).