Facile synthesis of indene and fluorene derivatives through AlCl<sub>3</sub>
-catalyzed cyclization of in situ formed iminium ions
作者:Lei Chen、Wei Teng、Xin-Le Geng、Yi-Fan Zhu、Yong-Hong Guan、Xiaohui Fan
DOI:10.1002/aoc.3863
日期:2017.12
A simple AlCl3‐catalyzed condensation/cyclization cascade process between aldehydes and sulfonamide is reported, in which two new bonds and one five‐membered ring are simultaneously formed with water as the byproduct. This method provides a rapid access to indenamine and 9‐aminofluorene derivatives. Additionally, these products can be transformed into corresponding indanones and fluorenones under the
A facile access to indene frameworks through condensation of substituted cinnamylaldehydes and sulfonylamines under the catalysis of FeCl3 is reported.