Sequential Electrophilic Trifluoromethanesulfanylation–Cyclization of Tryptamine Derivatives: Synthesis of C(3)-Trifluoromethanesulfanylated Hexahydropyrrolo[2,3-<i>b</i>]indoles
作者:Yi Yang、Xueliang Jiang、Feng-Ling Qing
DOI:10.1021/jo3013385
日期:2012.9.7
A practical and efficient synthesis of C(3)-trifluoromethanesulfanylated hexahydropyrrolo[2,3-b]indoles 5 from tryptamine derivatives was described. The features of this synthesis included electrophilic activation of C(3) of tryptamine derivatives with “CF3S+” and cascade ring cyclization by carbamate nucleophile attacking at C(2). Surprisingly, when Lewis acid (BF3·OEt2) was used as activator instead
实用和有效的合成C(3)-三氟甲烷磺酰化六氢吡咯并[2,3- b ]吲哚5从色胺衍生物。该合成的特征包括对带有“ CF 3 S + ”的色胺胺衍生物的C(3)进行亲电活化,并通过攻击C(2)的氨基甲酸酯亲核试剂实现级联环环化。出乎意料的是,当使用路易斯酸(BF 3 ·OEt 2)代替质子酸(TsOH·H 2 O)进行色胺胺衍生物的亲电子三氟甲烷磺酰化反应时,未环化产物6是优先组建的。此顺序的三氟甲烷磺酰化-环化方案用于合成几种吡咯烷基吲哚类生物碱类似物。评估了这些三氟甲烷磺酰化生物碱类似物对三种癌细胞系(K562,HeLa,L929)的细胞毒性活性。