methyl-3-hydroxy-5-phenylpentanoate and (6E)-ethyl 5-hydroxy-3-oxo-7-phenylhept-6-enoate is described in high enantiomeric excess and good yields. The effect of different lipases in different solvents has been screened using different acylating agents. This protocol has been extended for the preparation of enantiomerically pure biologically important kavalactones.
Total synthesis of styryl lactone natural products cryptomoscatone D1, D2, and (5R,7S)-kurzilactone has been accomplished in good yield from commercial available trans-cinnamaldehyde. The key steps involved in these syntheses are Mukaiyama aldol reaction, diastereoselective reduction, Brown’s allylation, and ringclosingmetathesis.
A stereoselective total synthesis of parvistone C, an oxygenated natural styryllactone, has been accomplished in excellent overall yield by employing asymmetric aldol reaction, asymmetric epoxidation and regioselective epoxide ring opening as the key steps. Our synthetic strategy is very simple, concise and no use of protecting groups.