Fe(OTf)3, was found to be a good catalyst for the cyclization of alkenyl N,O-acetals to give various nitrogen-containing heterocycles in high yields.
Fe(OTf)3 被发现是烯基 N,O-缩醛环化的良好催化剂,可以高产率得到各种含氮杂环。
Synthesis of functionalized isoindolinones: Addition of in situ generated organoalanes to acyliminium ions
作者:Joshua G. Pierce、David L. Waller、Peter Wipf
DOI:10.1016/j.jorganchem.2007.05.035
日期:2007.10
Addition of in situ generated di- or trisubstituted alkenylalanes to N-acyliminium ions provides rapid access to functionalized isoindolinones. Subsequent ring closing metathesis leads to tricyclic products. These transformations proceed under mild conditions and allow for the convergent synthesis of biologically significant scaffolds from readily available starting materials.[GRAPHICS](C) 2007 Elsevier B.V. All rights reserved.
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.
Synthesis of a library of tricyclic azepinoisoindolinones
作者:Bettina Miller、Shuli Mao、Kara M George Rosenker、Joshua G Pierce、Peter Wipf
DOI:10.3762/bjoc.8.120
日期:——
Hydrozirconation of 1-hexyne, the addition to in situ prepared N-acyliminium species, and ring-closing metathesis (RCM) were key steps in the preparation of a tricyclic isoindolinone scaffold. An unusual alkene isomerization process during the RCM was identified and studied in some detail. Chemical diversification for library synthesis was achieved by a subsequent alkene epoxidation and zinc-mediated aminolysis reaction. The resulting library products provided selective hits among a large number of high-throughput screens reported in PubChem, thus illustrating the utility of the novel scaffold.