The first Pummerer cyclisations on solid phase. Convenient construction of oxindoles enabled by a sulfur-link to resin
作者:Laura A. McAllister、Stephen Brand、R�my de Gentile、David J. Procter
DOI:10.1039/b307586a
日期:——
α-Sulfanyl N-aryl acetamides, attached to resin via the sulfur atom, undergo efficient Pummerer cyclisation upon activation of the sulfur link, to give oxindoles; heterocyclic products can be cleaved from the resin in a traceless manner using samarium(II) iodide.
Solid Phase Approaches to <i>N</i>-Heterocycles Using a Sulfur Linker Cleaved by SmI<sub>2</sub>
作者:Laura A. McAllister、Kristy L. Turner、Stephen Brand、Mark Stefaniak、David J. Procter
DOI:10.1021/jo060940n
日期:2006.8.1
A sulfur HASC (α-hetero-atom substituted carbonyl) linker has been utilized in solid-phase approaches to oxindoles and tetrahydroquinolones. The route to oxindoles employs the first Pummerer cyclizations on solidphase, whereas the route to tetrahydroquinolones involves a microwave-assisted Heck reaction followed by a Michael cyclization. In both cases, the linker is cleaved in a traceless fashion