Scheme 1.
Mechanistic studies. [a] Boronate 36 was prepared in situ from 35 (1.0 equiv) and PhLi (1.1 equiv). [b] Intermediate 51 was prepared in situ from hex‐1‐en‐6‐yl boronic acid pinacol ester (1.1 equiv) and PhLi (1.2 equiv). [c] Using 1.1 equiv of 36 prepared in situ from 35 (1.1 equiv) and PhLi (1.2 equiv).