Regioselective [1N+2C+2C] Assembly of Fully Decorated Pyrroles from Primary Amines, 1,2-Diaza-1,3-dienes, and 2,3-Allenoates
作者:Francesca R. Perrulli、Gianfranco Favi、Lucia De Crescentini、Orazio A. Attanasi、Stefania Santeusanio、Fabio Mantellini
DOI:10.1002/ejoc.201501017
日期:2015.11
A mild, sequential multicomponent reaction strategy for the regioselective synthesis of functionalized pentasubstituted pyrrolesfrom readily accessible primaryamines, 1,2-diaza-1,3-dienes, and 2,3-allenoates, has been developed. The process allows a [1N+2C+2C] annulation to be achieved through two sequential hydroamination reactions followed by an enamine-carbocyclization. Moreover, allenoates, as
1,2-Diaza-1,3-dienes easily react as Michael acceptors with arylamidoximes in a one-pot, high-yield heterocyclization process. Depending on the linear or cyclic structure of the ene mojety, 1,2,4-oxadiazin-5-ones or spiro cycloalkyl-1,2,4-oxadiazin-5-one derivatives can be directly obtained.
Challenge N- versus O-six-membered annulation: FeCl3-catalyzed synthesis of heterocyclic N,O-aminals
作者:Giacomo Mari、Lucia De Crescentini、Gianfranco Favi、Fabio Mantellini、Diego Olivieri、Stefania Santeusanio
DOI:10.3762/bjoc.20.123
日期:——
Abstract A new class of heterocyclicN,O-aminal and hemiaminal scaffolds was successfully obtained by means of a three-component reaction (3-CR) of 1,2-diaza-1,3-dienes (DDs), α-aminoacetals and iso(thio)cyanates. These stable imine surrogates are generated from key-substituted (thio)hydantoin intermediates through selective FeCl3-catalyzed intramolecular N-annulation. Beilstein J. Org. Chem. 2024