Benzotriazole Reagents for the Syntheses of Fmoc-, Boc-, and Alloc-Protected Amino Acids
作者:Alan Katritzky、Tarek Ibrahim、Srinivasa Tala、Said El-Feky、Zakaria Abdel-Samii
DOI:10.1055/s-0030-1261160
日期:2011.9
Stable Fmoc-, Boc-, and Alloc-benzotriazoles react with various amino acids including unprotected serine and glutamic acid, in the presence of triethylamine at 20 ËC as reagents to introduce α-amino protecting groups to afford Fmoc-, Boc-, and Alloc-protected amino acids (77-94%) free of dipeptide and tripeptide impurities. Fmoc-, and Alloc-Gly-Gly-OH dipeptides were prepared in 90% yields by N-acylation of glycylglycine with Fmoc- and Alloc-benzotriazoles in the presence of triethylamine. Synthesized N-protected amino acids were greater than 99% pure, analyzed by HPLC.
在20℃下,稳定的三种苯并三唑(Fmoc-、Boc-和Alloc-苯并三唑)在三乙胺的存在下能够与多种氨基酸,包括未保护的丝氨酸和谷氨酸,反应,作为引入α-氨基保护基团的试剂,生成自由基肽和三肽杂质的无Fmoc-、Boc-和Alloc-保护氨基酸(产率77-94%)。通过在三乙胺存在下,用Fmoc-和Alloc-苯并三唑对甘氨酰甘氨酸进行N-酰化反应,制备了产率高达90%的Fmoc-和Alloc-甘氨酰甘氨酸二肽。通过HPLC分析,合成的N-保护氨基酸纯度高于99%。