Isoprene-catalyzed lithiation of imidazole: synthesis of 2-(hydroxyalkyl)- and 2-(aminoalkyl)imidazoles
作者:Rosario Torregrosa、Isidro M. Pastor、Miguel Yus
DOI:10.1016/j.tet.2005.09.024
日期:2005.11
of isoprene (20 mol%) in THF at room temperature. By reacting this organolithium with carbonyl electrophiles 2-(hydroxyalkyl)imidazoles 3 were obtained, in good yields. As a result of the reaction of the mentioned lithium intermediate with imines 4, the corresponding 2-(aminoalkyl)imidazoles 5 were isolated in excellent yields.
2-Ethenyl-1H-imidazoles 6 were readily prepared by treating 2-(1-hydroxyalkyl)-1H-imidazoles 5 with hot acetic anhydride. Several convenient procedures to precursors of 6 are described.
Deconstructive Cyanomethylation Enabled by Radical Cross‐Coupling through Multiple C−C Bond and C−H Bond Cleavage
作者:Changzhen Yin、Wei Liu、Qiang Wu、Miao Wang、Peng Hu
DOI:10.1002/adsc.202300183
日期:——
ketones. Notably, the highly challenging reaction involves twice C−C single bondcleavage through β-scission of alkoxyl radical intermediates, and twice C(sp3)−H bond transformation via hydrogen atom transfer (HAT) procedures, resulting in two carbon radical species that realize a radical cross-coupling process to form a new C(sp3)−C(sp3) bond selectively. α-arylketo and α-aryl substituted tertiary alcohols