Enantioenriched synthesis of Escitalopram using lithiation–borylation methodology
作者:Benjamin M. Partridge、Stephen P. Thomas、Varinder K. Aggarwal
DOI:10.1016/j.tet.2011.09.142
日期:2011.12
The asymmetric synthesis of Escitalopram has been completed using a lithiation–borylation reaction as the key step. Suitably functionalized enantioenriched carbamate (er 98:2) and boronicester coupling partners were prepared and following deprotonation with s-BuLi and borylation, the tertiary alcohol was obtained in 42% yield and 93:7 er. The lithiation–borylation reaction was found to tolerate nitrile