1-Triflylpyrroles as efficient dienophiles in normal electron demand [4+2] cycloaddition reactions under pressure
作者:Antony Chrétien、Isabelle Chataigner、Serge R. Piettre
DOI:10.1039/b414978e
日期:——
1-Triflylpyrroles bearing acetyl group(s) on position 3, or 2 and 4, are efficient dienophiles in normal electron demand Diels-Alder reactions activated by high pressures and Lewis acids.
Synthesis of <i>N</i>-alkoxycarbonyl Pyrroles from <i>O</i>-Substituted Carbamates: A Synthetically Enabling Pyrrole Protection Strategy
作者:Jodie L. Hann、Catherine L. Lyall、Gabriele Kociok-Köhn、Simon E. Lewis
DOI:10.1021/acs.joc.3c01257
日期:2023.10.6
5-dimethoxytetrahydrofuran gives N-alkoxycarbonyl pyrroles in a single step and in good yield. By this method, several common amine protecting groups can be introduced on the pyrrole nitrogen. With the exception of N-Boc, N-alkoxycarbonyl groups have seen only minimal use for protection of the pyrrole nitrogen to date. Here, we show that N-alkoxycarbonyl protection can endow pyrrole with distinct reactivity in comparison