Synthesis of α-N-Ethylamino Acids and their Derivatives
作者:Hartmut Schedel、Klaus Burger
DOI:10.1007/s007060070057
日期:2000.9.22
A new synthesis of alpha-N-ethylamino acids starting from alpha-amino acids using hexafluoroacetone as protecting and activating agent is described. The hexafluoroacetone-protected N-ethylamino acid derivatives obtained are activated lactons. Therefore, they can be directly transformed without the need of an additional activation step with various nucleophiles into the corresponding carboxylic acid derivatives.
Synthesis of N-alkyl-N-methyl amino acids. Scope and limitations of base-induced N-alkylation of Cbz-amino acids
作者:Maciej Stodulski、Jacek Mlynarski
DOI:10.1016/j.tetasy.2008.03.025
日期:2008.5
The reaction of N-benzyloxycarbonyl derivatives of aliphatic amino acids with NaH/alkyl iodides gave the corresponding N-Cbz-N-alkyl derivatives in good to high yields. The scope and limitations of this simple N-alkylation reaction were investigated as a convenient and flexible attempt to prepare unsymmetrically N,N-diprotected alpha-amino acids. The procedure is based on the N-alkylation of N-carbamoyl amino acids, a one-pot deprotection/protection sequence without extensive purification of the products. Protection of the carboxyl function is not required while the starting materials are inexpensive and commercially available. (C) 2008 Elsevier Ltd. All rights reserved.
作者:Groeger, Ulrich、Drauz, Karlheinz、Klenk, Herbert
DOI:——
日期:——
Tuning of protease resistance in oligopeptides through <i>N</i>-alkylation
作者:Revital Kaminker、Athina Anastasaki、Will R. Gutekunst、Yingdong Luo、Sang-Ho Lee、Craig J. Hawker
DOI:10.1039/c8cc04407d
日期:——
In this work we demonstrate a strategy for tuning proteolysis of oligopeptides by expanding the N-alkylation of peptides beyond the common methyl group.