Intramolecular azide-alkene cycloaddition-elimination reaction in an aldohex-2-enonic acid derivative
作者:Evangelina Repetto、Guillermo A. Oliveira Udry、Oscar Varela
DOI:10.1016/j.carres.2019.107751
日期:2019.9
5-lactone in six steps, underwent an intramolecular cycloaddition-elimination pathway under mild conditions, yielding a chiral, substituted 5,6-dihydro-4H-pyrrolo[1,2-c]-1,2,3-triazole. The conditions were optimized to give exclusive formation of the triazole. The mechanism appears to involve intramolecular ring closure via a 1,3-dipolar azide-alkene cycloaddition to give a 1,2,3-triazoline, followed
从D-glucono-1,5-内酯分六步获得的6-叠氮基-2-甲苯磺酸酯在温和的条件下经历了分子内环加成消除途径,产生了手性取代的5,6-二氢-4H-吡咯并[ 1,2-c] -1,2,3-三唑。最优化条件以排他性地形成三唑。该机制似乎涉及通过1,3-偶极的叠氮化物-烯烃环加成反应生成1,2,3-三唑啉的分子内环闭合,然后消除对甲苯磺酸,导致芳构化。通过化学修饰获得的三唑产品有望显示出作为酶抑制剂的活性。此外,将2-己酸的部分保护的衍生物制备为有用的合成中间体。