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-butyl esters 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-butyl esters.
通过在DCM中使用α-氨基酯和ZnBr 2,探索了在其他酸不稳定基团存在下叔丁基酯的化学选择性水解。尽管发现N -Boc和N-三苯甲基不稳定,但PhF保护的胺与这些路易斯酸脱保护条件兼容,因此可以从其相应的叔丁基酯中以高收率制备各种N-(PhF)氨基酸。