Abstract
Dimethyl dimedone, a non chiral and cheap compound, has been converted to the optically actives 1-(R)- cis - and 1-(R)- trans -chrysanthemic acids possessing high economic value. These processes involve as the key steps (i) a cyclopropanation reaction (ii) a Grob fragmentation and (iii) a lipase monitored hydrolysis of a prochiral diacetate.
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