Cycloaddition of Acyclic Nitrones with Phenyl Isocyanate: Synthesis and Ring‐Opening Reactions of 1,2,4‐Oxadiazolidin‐5‐ones
作者:Necdet Coşkun、Aydın Parlar
DOI:10.1080/00397910500501466
日期:2006.5
unsubstituted or electron‐donating substituents on the C‐phenyl 1a,c,f with phenyl isocyanate proceeds smoothly for a short time with high yields to give the corresponding 1,2,4‐oxadiazolidinone 2, and 1b,d,e with electron‐withdrawing substituents gave the corresponding oxadiazolidinone in moderate yields after prolonged heating. Oxadiazolidinones 2a,c,f undergo diethylamine‐inducedfragmentation for a short
Copper(<scp>i</scp>) catalyzed diastereoselective multicomponent synthesis of spiroindolo-pyrrolidines/-imidazolidines/-triazolidines from diazoamides via azomethine ylides
of regio-, chemo- and diastereoselective studies on three- as well as four-component reactions using diazooxindoles, imines, aldehydes, amines, alkenes, alkynes or diazenes in the presence of copper(I) thiophene-2-carboxylate are performed to furnish spiroindolo-pyrrolidine/-imidazolidine/-triazolidine ring systems in good yields. A mixture of products was obtained when unsymmetrical alkenes were used
Electrochemical radical–radical cross-coupling: direct access to β-amino nitriles from unactivated imines and alkyl nitriles
作者:Wei-Mei Zeng、Zhi-Lv Wang、Yan-Hong He、Zhi Guan
DOI:10.1039/d2gc00457g
日期:——
nitriles from unactivated imines and alkyl nitriles by electrochemical radical–radical cross-coupling was described for the first time. The use of abundant and inexpensive alkyl nitriles without pre-functionalization for the reductive cyanoalkylation of imines makes the reaction atom- and step-economical. This synthetic strategy provides a green, mild and efficientmethod for the construction of β-amino
In this article, an electrochemical method for the directsynthesis of β-aminoalcohols from imines and ketones is described. Mechanistic studies, including a radical trapping experiment, electron paramagnetic resonance, cyclic voltammetry, and divided-cell electrolysis experiment, support the radical-involved reductive cross coupling of imines with ketones at the cathode. The use of abundant and easily