Enantioselective Synthesis and Cross-Coupling of Tertiary Propargylic Boronic Esters Using Lithiation-Borylation of Propargylic Carbamates
作者:Benjamin M. Partridge、Laëtitia Chausset-Boissarie、Matthew Burns、Alexander P. Pulis、Varinder K. Aggarwal
DOI:10.1002/anie.201203198
日期:2012.11.19
Lithiation–borylation of propargyliccarbamates leads to tertiarypropargylicboronicesters in very high e.r., provided that ethylene glycol boronicesters are used. These versatile intermediates undergo a range of highly stereoselective transformations, including protodeboronation to give tertiary allenes and Suzuki–Miyaura cross‐couplings of tertiaryboron species leading to tetrasubstituted allenes