3. Unsuccessful Attempt to Synthesize the Key Styrene-Epoxide, 19: (a) DBU, DCM, rt, 36 h, 92%; (b) DIBAL-H, DCM, −78 to 0 °C; (c) PCC, DCM, 0 to 32 °C, 90% (2 Steps); (d) 30% H₂O₂, 1N NaOH, MeOH, 50 °C, 1 h; (e) MeI, K₂CO₃, Acetone, 32 °C, 2 h (12:40%; 13 15%; 14:23%).