Scheme 5.

Scope of ABB‐carbinols employed in the epoxide formation reaction. Reactions performed on 0.25 mmol scale and 0.1 M initial concentration. [a] Reaction also performed on 1.0 mmol scale to give 8 a in 93 % yield. [b] Intermediate iodohydrin purified before second step. [c] Stirred for 42 h after addition of K₂CO₃. [d] 0.05 M initial concentration. [e] From purified 5 r. [f] Semipinacol reaction also occurred in 36 % yield. [g] After addition of Boc₂O, heated at 80 °C for 18 h without K₂CO₃.