A novel and diastereoselective construction of H-pyrazolo[3,2-a]isoquinoline fused spirooxindoles via [3+2] cycloaddition
作者:Panneerselvam Yuvaraj、Boreddy S.R. Reddy
DOI:10.1016/j.tetlet.2013.11.116
日期:2014.1
A one-pot, highly efficient and diastereoselective construction of 1,2-dihyro-10′bH-spiro[indole-3,1′-pyrazole[3,2-a]isoquinoline]-2′-carboxylates via silver triflate-catalyzed [3+2] cycloaddition of N′-(2–alkynylbenzylidene)hydrazide with methyleneindolinones in good to excellent yield has been described. The transformation involves initially a condensation followed by 6-endo-intramolecular cyclization
一锅,高效和非对映选择性的结构,通过三氟甲磺酸银,1,2-dihyro-10'b H-螺[吲哚-3,1'-吡唑[3,2-a]异喹啉] -2'-羧酸盐已经描述了N '-(2-炔基亚苄基)酰肼与亚甲基吲哚满酮催化的[3 + 2]环加成反应具有良好的收率。该转化首先涉及缩合,然后进行6-内-分子内环化形成偶极,然后与亚甲基吲哚满酮进行[3 + 2]-环加成,最后消除β-氢。