nitrene insertion reaction into the β-vinyl C–H bond of acroleins with an electron-rich organic azide was developed. The reaction protocol can produce secondary enaminals in high yield with a broad substrate scope. In the reaction, acid mediated [3 + 2] cycloaddition of organic azides with an acrolein generated intermediate protonated triazolines, which were selectivelydecomposed into enaminals with
Atom Economical Multi-Substituted Pyrrole Synthesis from Aziridine
作者:Lingamurthy Macha、Ranjith Jala、Sang-Yun Na、Hyun-Joon Ha
DOI:10.3390/molecules27206869
日期:——
Multi-substituted pyrroles are synthesized from regiospecific aziridine ring-opening and subsequent intramolecular cyclization with a carbonyl group at the γ-position in the presence of Lewis acid or protic acid. This method is highly atom economical where all the atoms of the reactants are incorporated into the final product with the removal of water. This new protocol is applied to the synthesis of various
In this Letter, the alpha-fluoro-beta-amino acid directives were elegantly generated via a novel strategy of the nucleophilic addition of arynes and aziridines. C-N bonds were successfully constructed with high efficiency. With the utilization of TABF hydrate as the fluorinated reagent, fluorine atom could be assembled into the target molecule selectively. Interestingly, under another condition, unexpected indole spiro-derivatives could be achieved successfully. (C) 2014 Elsevier Ltd. All rights reserved.