Ring Enlargement Reaction of C,N-Cyclic-N′-acyl Azomethine Imines with Sulfonium Ylide: An Efficient Synthesis of 3-Benzazepine Derivatives
摘要:
Highly efficient formation of 3-benzazepine derivatives has been achieved, based on the ring expansion reaction of C,N-cyclic-N'-acyl azomethine imines with sulfonium ylide generated in situ from the corresponding sulfonium salt. The reactions proceeded smoothly to afford the tricyclic 3-benzazepine derivatives in good to high yields. A wide range of C,N-cyclic N'-acyl azomethine imines were applicable to this reaction.
[5 + 1] Cycloaddition of <i>C,N</i>-Cyclic <i>N</i>′-Acyl Azomethine Imines with Isocyanides
作者:Takahiro Soeta、Kaname Tamura、Yutaka Ukaji
DOI:10.1021/ol2034542
日期:2012.3.2
A catalyst-free [5 + 1] cycloaddition reaction between isocyanides and C,N-cyclic N′-acyl azomethineimines as the “isocyanophile” leading to novel heterocycles has been developed. These reactions proceeded quickly and cleanly to afford the corresponding imin-1,3,4-oxadiazin-6-one derivatives in high to excellent yields. A wide range of C,N-cyclic N′-acyl azomethineimines and isocyanides were applicable
A three-component reaction of C,N-cyclic N′-acyl azomethine imines, isocyanides, and azide compounds: effective synthesis of 1,5-disubstituted tetrazoles with tetrahydroisoquinoline skeletons
A multicomponent reaction of isocyanides and C,N-cyclic Nâ²-acyl azomethine imines in the presence of TMSCl and NaN3 leads to tetrazole derivatives. These reactions proceeded cleanly to afford the corresponding 1,5-disubstituted tetrazoles containing a tetrahydroisoquinoline skeleton in high to excellent yields.
with azomethineimines has successfully been developed under mild reaction conditions, affording biologically interesting tetrahydropyrazoloisoquinoline derivatives in high to excellent yields and with excellent stereoselectivity. The reaction follows a tandem [3+2] cycloaddition/allylation/elimination of AcOH pathway. Allenyl carbinol acetates also reacted well with in situ generated azomethine imine
Enantioselective 1,3-Dipolar Cycloaddition of <i>C</i>,<i>N</i>-Cyclic Azomethine Imines to Unsaturated Nitriles Catalyzed by Ni<sup>II</sup>–Pigiphos
作者:Sandra Milosevic、Antonio Togni
DOI:10.1021/jo401247d
日期:2013.10.4
The asymmetric 1,3-dipolarcycloaddition reaction of C,N-cyclicazomethineimines with small unsaturated nitriles using a dicationic Ni(II) complex containing the chiral triphosphine ligand bis(R)-1-[(Sp)-2-(diphenylphosphino)ferrocenyl]ethyl}cyclohexylphosphine [(R,Sp)-Pigiphos] as a catalyst has been developed. A variety of new chiral cyanopyrazolidines were obtained regio- and diastereoselectively
between bi‐ or mono‐N‐protected Dha and C,N‐cyclic azomethine imines, which afford various quaternary amino acids with diverse scaffolds, is disclosed. Specifically, normal‐electron‐demand 1,3‐DC reaction occurs between bi‐N‐protected Dha and C,N‐cyclic azomethine imines, while inverse‐electron‐demand 1,3‐DC reaction occurs between mono‐N‐protected Dha and C,N‐cyclic azomethine imines. Above all, the