Solid-Phase Synthesis of CyclicC-Glycoside/Amino Acid Hybrids by Carbamate Coupling Chemistry and On-Support Cyclization
作者:Johanna Katajisto、Harri Lönnberg
DOI:10.1002/ejoc.200500273
日期:2005.8
conducted by alternating peptide and carbamate coupling, using glutamate immobilized through its γ-carboxy function to a SCAL linker as a handle. On-support cyclization followed by cleavage from the support gave the desired conjugates. Removal of the p-toluoyl protections was carried out in solution phase by methoxide ion-catalyzed transesterification in methanol. (© Wiley-VCH Verlag GmbH & Co. KGaA
描述了环状 C-糖苷/氨基酸缀合物的固体支持合成。为此,N-(叔丁氧基羰基)-[6-O-(对硝基苯氧基羰基)-2,3,4-三-O-(对甲苯甲酰基)-β-D-吡喃葡萄糖基]甲胺衍生自半乳糖和制备葡萄糖并与适当保护的氨基酸一起用作活化单体。线性前体的固相组装通过交替的肽和氨基甲酸酯偶联进行,使用通过其 γ-羧基功能固定到 SCAL 接头的谷氨酸作为手柄。在载体上环化,然后从载体上裂解,得到所需的偶联物。通过甲醇中的甲醇离子催化的酯交换在溶液相中去除对甲苯甲酰基保护。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)