2,2,4,6,7-Pentamethyl-2,3-dihydrobenzofuran-5-methyl (Pbfm) as an Alternative to the Trityl Group for the Side-Chain Protection of Cysteine and Asparagine/Glutamine
作者:Oscar Garcia、Josep M. Bofill、Ernesto Nicolas、Fernando Albericio
DOI:10.1002/ejoc.201000201
日期:2010.7
The benzyl derivative of the Pbf group, which is the most commonly used side-chain protecting group for Arg, has been proposed for the protection of the side chains of Cys, Asp, and Glu. In the three cases, the new protecting group (Pbfm) was removed with a high concentration of TFA during the cleavage and global deprotection step. In addition, the Pbfm group can be removed from the Cys residue by
Pbf 基团的苄基衍生物是 Arg 最常用的侧链保护基团,已被提议用于保护 Cys、Asp 和 Glu 的侧链。在这三种情况下,新的保护基团 (Pbfm) 在裂解和全局脱保护步骤中被高浓度的 TFA 去除。此外,可以使用非常稀的 TFA 溶液从 Cys 残留物中去除 Pbfm 基团。此外,当 Cys 被 Pbfm 基团保护时,它可以通过氧化处理去除,从而直接在固相上形成二硫键。