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a) TPAP, NMO, CH2Cl2, sieves mol, 2 to 4 62%, 3 to 5, 73%; b) Shi epoxidation conditions [7]: Oxone® (5 equiv), aq. K2CO3, Na2EDTA (0.4mM, aq.sol.), Buffer pH=10.5, (Bu4N+)2SO4, CH3CN, 0%. c) Yang epoxidation conditions [8] (pH= 7.5): Oxone® (10 eq.), NaHCO3 (15 eq.), Na2EDTA (0.4mM, aq.sol.), CH3CN/H2O, 60%.
