A Facile Synthesis of 4,6,7,8,8<i>a</i>,9-Hexahydropyrrolo[1,2-<i>a</i>][1,2,3]triazolo[1,5-<i>d</i>]pyrazines by a Three-Component Coupling Reaction Followed by Intramolecular 1,3-Dipolar Cycloaddition
作者:Attrimuni P. Dhondge、Shakil N. Afraj、Cut Nuzlia、Chinpiao Chen、Gene-Hsian Lee
DOI:10.1002/ejoc.201300226
日期:2013.7
A practical and efficient two-step protocol for the synthesis of several new 4,6,7,8,8a,9-hexahydropyrrolo[1,2-a][1,2,3]triazolo[1,5-d]pyrazines is described. The first step involves the AuBr3-catalyzed three-component coupling reaction of terminal alkynes, aldehydes, and amines under solvent-free conditions to provide the requisite propargylamines. The reaction tolerates a high structural diversity
一种实用高效的两步法合成几种新的 4,6,7,8,8a,9-六氢吡咯并[1,2-a][1,2,3]三唑并[1,5-d]吡嗪被描述。第一步涉及 AuBr3 催化的末端炔烃、醛和胺在无溶剂条件下的三组分偶联反应,以提供必需的炔丙胺。该反应具有高度的结构多样性,只需要很短的反应时间,具有高非对映选择性,并且对环境无害。此外,炔丙胺产物经过无催化剂分子内叠氮化物-炔[3 + 2]偶极环加成反应得到4,6,7,8,8a,9-六氢吡咯并[1,2-a][1,2,3 ]三唑并[1,5-d]吡嗪以优异的产率和优异的非对映选择性。