Autotandem Catalysis: Inexpensive and Green Access to Functionalized Ketones by Intermolecular Iron‐Catalyzed Amidoalkynylation/Hydration Cascade Reaction via
<i>N</i>
‐Acyliminium Ion Chemistry
作者:Sidi Mohamed Abdallahi、Ewies F. Ewies、Mohamed El‐Shazly、Brahim Ould Elemine、Abderrahmane Hadou、Ján Moncol、Ata Martin Lawson、Adam Daich、Mohamed Othman
DOI:10.1002/chem.202102357
日期:2021.11.5
intermolecular alkynylation reactions of various alkoxy, acetoxylactams, and hydroxylactams. This chemistry broadens the scope of iron catalysis by highlighting new aspects of iron salts σ-Lewis acidity. More importantly, this approach is amenable to an unprecedented tandem intermolecular alkynylation/intramolecular hydration sequence affording expedient access to a new carbonyl structures.
Synthesis of (Arylamido)pyrrolidinone Libraries through Ritter-Type Cascade Reactions of Dihydroxylactams
作者:Peng Wu、Michael Åxman Petersen、Rico Petersen、Martin Ohsten Rasmussen、Karine Bonnet、Thomas E. Nielsen、Mads H. Clausen
DOI:10.1002/ejoc.201500712
日期:2015.9
The Ritter-typereaction of arylnitriles and N-acyliminium ions generated in situ from dihydroxy-γ-lactams gave tetrahydropyrrolo[2,3-d]oxazol-5-ones in excellent yields. A subsequent acidic hydrolysis in EtOH/H2O/TFA (trifluoroacetic acid) yielded new (arylamido)pyrrolidinones with excellent cis diastereoselectivity. A combined one-step Ritter–hydrolysis procedure proved to be of equal efficiency
Metal-Catalyzed Cycloisomerization Reactions of <i>cis</i>-4-Hydroxy-5-alkynylpyrrolidinones and <i>cis</i>-5-Hydroxy-6-alkynylpiperidinones: Synthesis of Furo[3,2-<i>b</i>]pyrroles and Furo[3,2-<i>b</i>]pyridines
作者:Jasmine C. Jury、Nalivela Kumara Swamy、Arife Yazici、Anthony C. Willis、Stephen G. Pyne
DOI:10.1021/jo9007942
日期:2009.8.7
Furo[3,2-b]pyrroles and furo[3,2-b]pyridines can be conveniently prepared in good yields from the cycloisomerization reactions of cis-4-hydroxy-5-alkynylpyrrolidinones and cis-5-hydroxy-6-alkynylpiperidinones, respectively, using Ag(I), Pd(II)/Cu(I), or Au(I) catalysis. In one case, the cycloisomerization product was unstable and produced a furanderivative by a ring-opening reaction.
顺式-4-羟基-5-炔基吡咯烷酮与顺式-5-羟基-6-炔基哌啶子酮的环异构化反应可方便地以高收率制备呋喃并[3,2- b ]吡咯和呋喃[3,2- b ]吡啶分别使用Ag(I),Pd(II)/ Cu(I)或Au(I)催化。在一种情况下,环异构化产物不稳定并且通过开环反应产生呋喃衍生物。
Diastereoselective Ritter Reactions of Chiral Cyclic <i>N</i>-Acyliminium Ions: Synthesis of Pyrido- and Pyrrolo[2,3-<i>d</i>]oxazoles and 4-Hydroxy-5-<i>N</i>-acylaminopyrrolidines and 5-Hydroxy-6-<i>N</i>-acylaminopiperidines
作者:Ian R. Morgan、Arife Yazici、Stephen G. Pyne、Brian W. Skelton
DOI:10.1021/jo800007g
日期:2008.4.1
Pyrido- and pyrrolo[2,3-d]oxazoles can be conveniently prepared in high yield from the Ritter reaction of nitriles and in situ generated chiral cyclic N-acyliminium ions. cis-4-Hydroxy-5-acylaminopyrrolidines and cis-5-hydroxy-6-acylaminopiperidines can be readily obtained by acid hydrolysis of these bicyclic heterocyclic compounds, respectively.
Diastereoselective borono-Mannich reactions on cyclic N-acyliminium ions
作者:Ian R. Morgan、Arife Yazici、Stephen G. Pyne
DOI:10.1016/j.tet.2007.11.046
日期:2008.2
The addition of boronic acids to five- and six-memberedring N-acyliminium ions has been employed to prepare 5- and 6-substituted 4-hydroxypyrrolidin-2-ones and 5-hydroxypiperidin-2-ones, respectively, in a diastereoselective fashion.