Exocyclic-EndocyclicN-Acyliminium Ion Equilibration via an Intramolecular α-Thioamidoalkylation in the Synthesis of Fused N,S-Heterocyclic Systems: Some New Parameters
The reactivity of N-[aryl(or alkyl)thio(oxo or seleno)alkylamidals 6 bearing the N-(CH2)n-X-(CH2)m-Ar functionality towards neat TFA has been examined. Substrates of type 6 give, together with the products 11, 17, 19, and 25 of the “expected” π-cyclization process, the “unexpected” products 12, 18, and 26 resulting from a new tandem heteroamidoalkylation/isomerization/π-cyclization. The composition
Bi(OTf)
<sub>3</sub>
‐Catalysed Access to 2,3‐Substituted Isoindolinones and Tricyclic N,O‐Acetals by Trapping of Bis‐
<i>N</i>
‐Acyliminium Species in a Tandem Process
作者:Ahmed Aliyenne、Frédéric Pin、Vijaykumar D. Nimbarte、Ata Martin Lawson、Sébastien Comesse、Morgane Sanselme、Vincent Tognetti、Laurent Joubert、Adam Daïch
DOI:10.1002/ejoc.201600530
日期:2016.7
New 1,3-bis-N-acyliminium species generated easily with nontoxic Bi(OTf)3 catalyst at very low loadings (2 mol-%) were trapped inter- and intramolecularly with various poly-nucleophiles. This mild, efficient, practical and general tandem approach provides an array of substitutedisoindolinones and cyclic N,O-acetals.