A Practical and Efficient Approach to PNA Monomers Compatible with Fmoc-Mediated Solid-Phase Synthesis Protocols
作者:Andrea Porcheddu、Giampaolo Giacomelli、Ivana Piredda、Mariolino Carta、Giammario Nieddu
DOI:10.1002/ejoc.200800891
日期:2008.12
A straightforward synthesis of orthogonally protected PNA monomers is described. Protected aminoethylglycine (Aeg) monomers were efficiently prepared by reductive amination of N-Fmoc-glycinaldehyde with glycine methyl ester and the subsequent acylation of the free amine with N-bis-Boc-protected nucleobase acetic acids. The exocyclic amine group of the nucleobases, including the notoriously difficult-to-protect
描述了正交保护的 PNA 单体的直接合成。受保护的氨基乙基甘氨酸 (Aeg) 单体通过 N-Fmoc-甘氨酸醛与甘氨酸甲酯的还原胺化和随后的游离胺与 N-双-Boc 保护的核碱基乙酸酰化来有效制备。核碱基的环外胺基团,包括众所周知的难以保护的鸟嘌呤核碱基,被双 Boc 氨基甲酸酯基团保护;这增加了核碱基在最常见有机溶剂中的溶解度。目前的协议允许在微观和宏观尺度上制备所有 Aeg 单体, 这避免或最大限度地减少了有毒试剂或溶剂的使用, 此外, 还使用了廉价的起始材料。