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.
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
Asymmetric Synthesis of Tetrahydroquinolines through a [3+2] Cycloaddition Controlled by Dienamine Catalysis
作者:Wenjun Li、Jia Wei、Qianfa Jia、Zhiyun Du、Kun Zhang、Jian Wang
DOI:10.1002/chem.201402089
日期:2014.5.26
A dienamine‐mediated enantioselective 1,3‐dipolar cycloaddition catalyzed by a chiral prolinol silyl ether catalyst has been developed. Removal of the benzamide group of the intermediates could furnish chiral C‐1 substituted tetrahydroisoquinolines (see scheme) in high yields and excellent stereoselectivities.
A yet-unexploited class of azomethine imines, C,N-cyclic azomethine imines, could be successfully employed in highly enantioselective1,3-dipolarcycloaddition with enals catalyzed by titanium-BINOLate to give pharmaceutically attractive tetrahydroisoquinoline and piperidine motifs.