Hexafluoroisopropanol as solvent and promotor in the Paal-Knorr synthesis of N-substituted diaryl pyrroles
作者:Robert H.E. Schirmacher、Daniel Rösch、Franziska Thomas
DOI:10.1016/j.tet.2021.131985
日期:2021.3
An additive-free synthesis of challenging N-substituted aryl pyrrolesfrom the often poorly soluble corresponding 1,4-diketones by means of the Paal-Knorr pyrrole synthesis is reported, which makes use of the unique properties of 1,1,1,3,3,3-hexafluoroisopropanol (HFIP) as a solvent and reaction promotor. Our procedure offers simple execution and purification as well as easy scale-up and can be applied
An Efficient Method for the N‐Debenzylation of Aromatic Heterocycles
作者:T. Srinivasa Rao、Pramod S. Pandey
DOI:10.1081/scc-200028570
日期:2004.1
Abstract The N‐debenzylation of aromatic heterocycles such as substituted pyrroles and indoles, having functional groups like ester, amide, halo, and nitrile, by using sodium in liquidammonia in the presence of t‐BuOH at −78°C cleanly affords N‐debenzylated aromatic heterocycles in good yields.