Better the second time around: The title compounds were synthesized by using a one‐pot double methylene transfer catalyzed by a heterobimetallic La/Li complex. Chiral amplification in the second step was the key to obtaining oxetanes in high enantiomeric excess (see scheme).
Exploiting the Lithiation-Directing Ability of Oxetane for the Regioselective Preparation of Functionalized 2-Aryloxetane Scaffolds under Mild Conditions
作者:Donato Ivan Coppi、Antonio Salomone、Filippo Maria Perna、Vito Capriati
DOI:10.1002/anie.201109113
日期:2012.7.23
Oxetane nudges in the DoM direction! Regioselective ortho‐lithiation induced by an oxetane ring has been achieved. The reaction provides easy access to ortho‐functionalized 2‐aryloxetanes also through a lithiation/borylation Suzuki–Miyaura cross‐coupling. The lithiation‐directing ability of oxetane and the proton transfer mechanism have been investigated by competitive metalation and kinetic isotope