Amino Acid Bromides: Their N-Protection and Use in the Synthesis of Peptides with Extremely Difficult Sequences
作者:Alma DalPozzo、Minghong Ni、Laura Muzi、Andrea Caporale、Roberto de Castiglione、Bernard Kaptein、Quirinus B. Broxterman、Fernando Formaggio
DOI:10.1021/jo020280w
日期:2002.9.1
alpha-amino acid bromides were easily generated in situ with 1-bromo-N,N-2-trimethyl-1-propenylamine from the corresponding amino acids under very mild conditions. o-Nbs and the azido moieties proved to be compatible with these overactivated halides and were successfully applied in difficult peptide bond formations. N-Deprotection methods and the total step-by-step solution synthesis of a peptide containing
N-保护的α-氨基酸溴化物很容易与1-溴-N,N-2-N-2-三甲基-1-丙烯基胺在非常温和的条件下原位生成。o-Nbs和叠氮基部分与这些过度活化的卤化物相容,并成功应用于困难的肽键形成中。还报道了N-脱保护方法和包含多达七个连续的L-(αMe)缬氨酸残基的肽的逐步溶液合成。通过叠氮基/溴化物系统以单次重复操作在短时间内以很高的产率实现了该同肽的组装。