Selective <i>tert</i>-Butyl Ester Deprotection in the Presence of Acid Labile Protecting Groups with Use of ZnBr<sub>2</sub>
作者:Ramesh Kaul、Yann Brouillette、Zohreh Sajjadi、Karl A. Hansford、William D. Lubell
DOI:10.1021/jo0491206
日期:2004.9.1
hydrolysis of tert-butylesters in the presence of other acid-labile groups has been explored by employing α-amino esters and ZnBr2 in DCM. Although N-Boc and N-trityl groups were found to be labile, PhF protected amines were compatible with these Lewis acid deprotection conditions such that a variety of N-(PhF)amino acids were prepared in good yields from their corresponding tert-butylesters.