Synthesis of New Tetrazole-Substituted Pyroaminoadipic and Pipecolic Acid Derivatives
作者:Fatimazohra Lenda、Farhate Guenoun、Bouchra Tazi、Najib Ben larbi、Hassan Allouchi、Jean Martinez、Fr�d�ric Lamaty
DOI:10.1002/ejoc.200400328
日期:2005.1
Racemic 5-aryl- and 5-(arylmethyl)tetrazolyl-substituted pyroaminoadipic and pipecolic acid derivatives were diastereoselectively synthesized from dimethyl meso-2,5-dibromoadipate (1) in good yields under mild reaction conditions. The key step of this reaction sequence is the selective N2-alkylation of 5-substituted tetrazoles with 1. The reactive 2-bromo-5-tetrazolyladipate derivatives 2a−g were generated
外消旋 5-芳基-和 5-(芳甲基)四唑基取代的焦氨基己二酸和哌可酸衍生物是在温和的反应条件下以良好的产率从二甲基内消旋-2,5-二溴己二酸 (1) 非对映选择性合成的。该反应序列的关键步骤是 5-取代四唑与 1 的选择性 N2-烷基化。 生成反应性 2-溴-5-四唑基己二酸酯衍生物 2a-g 并用叠氮化钠处理,然后进行 Pd/C 催化氢化, 提供内酰胺 4a-g。用 BH3 化学选择性还原 4a-g 的酰胺羰基,然后进行酸水解,提供外消旋形式的 5-四唑基哌啶酸。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)