Full Chirality Transfer in the Conversion of Secondary Alcohols into Tertiary Boronic Esters and Alcohols Using Lithiation-Borylation Reactions
作者:Viktor Bagutski、Rosalind M. French、Varinder K. Aggarwal
DOI:10.1002/anie.201001371
日期:——
New conditions, full transfer: Using MgBr2/MeOH as an additive now provides essentially 100 % retention of configuration in the lithiation–borylation reaction, thus leading to tertiaryboronicesters (or tertiary alcohols) with exceptionally high ee values in all cases—even with rather hindered substrates and more stabilized lithiated carbamates (see scheme; Cb=carbamate, pin=OCMe2CMe2O).