Leveraging the Domino Skeletal Expansion of Thia-/Selenazolidinones via Nitrogen-Atom Transfer in Hexafluoroisopropanol: Room Temperature Access to Six-Membered S/Se,N-Heterocycles
作者:Vandana Jaiswal、Mangilal Godara、Dinabandhu Das、Vincent Gandon、Jaideep Saha
DOI:10.1021/acs.joc.1c02621
日期:2022.1.7
Herein, a highly regioselective domino skeletal-expansion process that transforms 2-aminothiazolidinone into six-membered S,N-heterocycle is developed with the aid of TMS-azide in hexafluoroisopropanol (HFIP) at ambient temperature. Functioning of the C2 tertiary amine as latent reactive group on thiazolidinone moiety was the key to this development, which allowed relay substitution with azide and
在此,在环境温度下,在六氟异丙醇 (HFIP) 中借助 TMS-叠氮化物,开发了一种高度区域选择性的多米诺骨架扩展工艺,该工艺将 2-氨基噻唑烷酮转化为六元 S,N-杂环。C2 叔胺作为噻唑烷酮部分上的潜在反应基团的功能是这一发展的关键,它允许用叠氮化物进行接力取代,并在无金属/酸的条件下进行后续的扩环。该反应还强调了从 TMS-叠氮化物到最终产物的分子间氮原子转移过程,其中不存在任何中间体叠氮噻唑烷酮。该策略可扩展到Se,N-杂环的类似合成,此外,还进行了后期药物修饰和后续转化。