Heterobimetallic Pd–Sn Catalysis: A Suzuki, Tandem Ring-Closing Sequence toward Indeno[2,1-<i>b</i>]thiophenes and Indeno[2,1-<i>b</i>]indoles
作者:Debjit Das、Sanjay Pratihar、Sujit Roy
DOI:10.1021/ol3021995
日期:2012.9.21
Indeno[2,1-b]thiophene and indeno[1,2-b]indole motifs have been obtained in moderate to good yields from easily available substituted boronic acids, 2-bromo aryl/vinyl aldehydes, and nucleophiles such as arenes/heteroarenes and others using a catalytic combination of bimetallic “Pd–Sn” and AgPF6. This formal three-component coupling involves a Suzuki reaction followed by nucleophile assisted tandem
茚并[2,1- b ]噻吩和茚并[1,2- b ]吲哚基序已经在中度至良好的产率从容易获得的取代的硼酸获得,2-溴芳基/乙烯基醛,和亲核试剂如芳烃/杂芳烃其他使用双金属“ Pd-Sn”和AgPF 6的催化组合。正式的三组分偶联涉及Suzuki反应,然后亲核试剂协助串联闭环。还完成了取代杂环稠合的茚,苯并芴和芴的顺序合成。