5. Synthesis of (±)-Combretastatin (2) and Erianin (4): (a) BCl₃–C₆H₅Me, DCM, −78 °C, 0.5 h; (b) MeI, K₂CO₃, Acetone, rt, 2 h, 96% (2 Steps); (c) m-CPBA, Na₂CO₃, DCM, 0 °C to rt, 36 h, 84%; (d) 2-(Benzyloxy)-4-bromo-1-methoxybenzene, t-BuLi, THF, −40 °C to rt, 0.5 h, 85%; (e) Pd–C/H₂, EtOAc, rt (for 2: 96%, for 4: 95%); (j) Ac₂O, Et₃N, DMAP, DCM, rt, 5 h, 98%.