A facile access to novel spiroxindole fused pyrrolidine and thiazolo pyrrolidine benzimidazole derivatives via 1,3-dipolar cycloaddition reaction
作者:Nataraj Poomathi、Sivakali Mayakrishnan、D. Muralidharan、Paramasivan T. Perumal
DOI:10.1016/j.tetlet.2014.12.088
日期:2015.1
2-c]thiazole] carbonitrile were synthesized via 1,3-dipolarcycloaddition (1,3-DC) reaction. The azomethine ylides generated in situ from isatin/N-substituted isatin and secondary amino acids (sarcosine/S-proline) reacted with benzo-imidazol-2-yl-3-phenylacrylonitrile as a dipolarophile to give spiroxindole fused pyrrolidine and thiazolo pyrrolidine benzimidazole derivatives in good yields. The structure and stereochemistry
一系列苯并[ d ]咪唑-2-基)-1'-甲基-2-氧代-4'-苯基螺[吲哚啉-3,2'-吡咯烷]和苯并[ d ]咪唑-2-基)-2氧代基-7'-苯基-3',6',7',7a'四氢-1' ħ -螺[二氢吲哚-3,5'-吡咯并[1,2- c ^ ]噻唑]腈分别经由1中合成,3-偶极环加成(1,3-DC)反应。由Isatin / N-取代的isatin和仲氨基酸(sarcosine / S-脯氨酸)原位生成的偶氮甲基化物与苯并咪唑-2-基-3-苯基丙烯腈作为双极性亲和剂反应生成螺并吲哚稠合的吡咯烷和噻唑并吡咯烷苯并咪唑衍生物丰产。1 H和13证实了环加合物的结构和立体化学C NMR光谱,质谱和单晶X射线衍射研究。