nitrilimines or nitrilylides, derived from the reactions of either N-phenylarenecarbohydrazonoyl chlorides or N-(p-nitrobenzyl)arenecarboximidoyl chlorides with triethylamine, to afford novel cyclic carbene–palladium(II) complexes, viz. 1,2,4-triazol-5(4H)-ylideneor 2-imidazolin-5-ylidenepalladium(II) ones, respectively. Halogen exchange reactions of the carbene complexes with lithium bromide or sodium iodide
exclusive formation of exo-configured products. 6H-1,2-Oxazines are therefore sufficiently reactive and selective dipolarophiles. The regioselectivity of the 1,3-dipolar cycloadditions is briefly discussed considering steric and electronic effects. PM3 calculations did not lead to fully satisfactory results in predicting the observed high regioselectivities. Preliminary subsequent reactions of the heterobicyclic
Reaction of nitrile ylides with isatins and o-benzoquinones: formation of novel spirooxazoline derivatives
作者:Vijay Nair、D Sethumadhavan、Smitha M Nair、S Viji、Nigam P Rath
DOI:10.1016/s0040-4020(02)00182-5
日期:2002.4
Nitrileylide generated by the base catalysed reaction of imidoyl chlorides underwent dipolar cycloaddition with isatins, phenanthrenequinone and acenaphthenequinone to afford novel spirooxazoline derivatives.
Diastereoselective One-Pot Synthesis of Tetrafunctionalized 2-Imidazolines
作者:Guido V. Janssen、Paul Slobbe、Maurice Mooijman、Art Kruithof、Andreas W. Ehlers、Célia Fonseca Guerra、F. Matthias Bickelhaupt、J. Chris Slootweg、Eelco Ruijter、Koop Lammertsma、Romano V. A. Orru
DOI:10.1021/jo500790n
日期:2014.6.6
tetrafunctionalized 2-imidazolines is described. Our approach to these valuable heterocyclic scaffolds involves a formal 1,3-dipolarcycloadditionbetween nitrile ylides or nitrilium triflates and imines. A detailed experimentalstudy in combination with a high-level computational exploration of reaction routes reveals a plausible reaction pathway that accounts for the observed diastereoselectivity