Synthesis of a Building Block for a Nucleic-Acid Analog with a Chiral, Flexible Peptide Backbone
作者:Dhanalekshmi Savithri、Christian Leumann、Rolf Scheffold
DOI:10.1002/hlca.19960790128
日期:1996.2.7
We present here a nine-step synthesis of the thymine-containing amino ester 1, starting from commercially available methyl N-[(tert-butoxy)carbonyl]-L-serinate. Amino ester 1 is considered as a building block for the preparation of a new nucleic-acid analog with a chiral, flexible polyamide backbone. Key steps in the synthesis are the vitamin-B12-catalyzed addition of 3-bromo-N-[(tert-butoxy)carbonyl]-L-alaninate
我们在这里介绍了一个九步合成的含胸腺嘧啶的氨基酯1,从市售N -[(叔丁氧基)羰基] -L-丝氨酸甲酯开始。氨基酸酯1被认为是制备具有手性,柔性聚酰胺骨架的新型核酸类似物的基础。合成中的关键步骤是将维生素B 12催化的3-溴-N -[(叔丁氧基)羰基] -L-丙氨酸酯2加到丙烯酸乙酯中,并将相应的N-保护的α-氨基酸进行同系化4成β-氨基酯6由Arndt-Eistert化学。发现后者在6中的不对称中心进行了10%的构型反转。然而,通过1的简单结晶很容易实现拆分为对映体纯的材料。