Fig. 4: Synthetic utility.

Further transformations of the hydroboration products. Reaction conditions: a NaBO₃, H₂O, THF; b KHF₂, MeCN, H₂O; c (1) vinylMgBr, THF, r.t; (2) I₂, MeOH, −78 °C; (3) NaOMe, MeOH; d (1) 1-bromo-3,5-dimethoxybenzene, tBuLi, THF, −78 °C; (2) NBS, THF, −78 °C; e (1) ClCH₂I, nBuLi, THF, −78 °C; (2) H₂O₂, NaOH, MeOH, H₂O.