<i>n</i>-butyllithium-mediated reactions of 1-(2-azidoarylmethyl)- 1<i>H</i>-benzotriazoles with alkyl halides
作者:Taehoon Kim、Kyongtae Kim
DOI:10.1002/jhet.275
日期:——
n-BuLi (2.5 equiv.) in THF at −78°C, followed by an addition of alkylhalides such as allyl, benzyl, and ethyl bromides with stirring for 2 h at room temperature afforded 2-(dialkylamino)-3-(benzotriazol-1-yl)-2H-indazoles (), 3-(benzotriazol- 1-yl)-2H-indazoles (), 2-[(benzotriazol-1-yl)methyl]arylamine (), and 2-[(benzotriazol-1-yl)(alkyl) methyl]arylamine (). J. Heterocyclic Chem., 2010.
Herein, we report the accomplishment of Rh2(II)-catalyzed intramolecular amination of aryl azide-tethered 1,3-dicarbonyls to access privileged heterocyclic scaffolds with exclusive diastereoselectivity under simple reaction conditions. This method also allows an unconventional direct α-amination at electron-deficient C(sp3)–H bonds of aryl azide-tethered 1,3-diketones to afford fused 2-azatricyclo[4
Bis(ketenimines), in which the two heterocumulenic functions are placed in close proximity on a carbon skeleton to allow their mutual interaction, show a rich and not easily predictable chemistry. Intramolecular [2 + 2] or [4 + 2] cycloadditions are, respectively, observed when both ketenimine functions are supported on either ortho-benzylic or 2,2'-biphenylenic scaffolds. In addition, nitrogen-to-carbon [1,3] and [1,5] shifts of arylmethyl groups in N-arylmethyl-C,C-diphenyl ketenimines are also disclosed.