Conjugated heterocumulenes. Synthesis of conjugated carbodiimides and their facile conversion via intramolecular cycloaddition into nitrogen heterocycles, quinoline and pyrido[2,3-b]indole (α-carboline) derivatives
Iminophosphorane-Mediated Annulation of 1,3,5-Triazine to Benzimidazole: Synthesis of 1,3,5-Triazino[1,2-<i>a</i>]benzimidazoles
作者:Pedro Molina、Angeles Lorenzo、Enrique Aller
DOI:10.1055/s-1992-26096
日期:——
A number of 1,3,5-triazino[1,2-a]benzimidazoles 5 and 7 have been prepared by aza-Wittig-type reaction of 2-(triphenylphosphoranylideneamino)benzimidazoles 2 and 6, which were derived from 2-aminobenzimidazoles, with isocyanates under neutral conditions.
One-Pot Synthesis of Phenylallyl Substituted Unsymmetrical Ureas Under Microwave Irradiation
作者:Lan-Qin Chai、Wei-Peng Chen、Xiao-Qiang Wang、Jian-Lin Ge
DOI:10.1080/10426500701407441
日期:2007.9.13
unsymmetrical ureas were synthesized in a one-pot procedure by reactions of cinnamoyl isocyanate, which was prepared from cinnamoyl azide by Curtius rearrangement, with various aromatic amines, 2-amino-5-aryl-1,3,4-thiadiazoles and 2-amino-5-aryloxymethylene-1,3,4-thiadiazoles undermicrowaveirradiation. Compared to conventional methods, this synthesis has the advantages of mild reaction conditions
A one-flask synthesis of 2-aminoimidazole derivatives based on the aza-Wittig reaction of alkyl 2-amino-3-azidoacrylates with isocyanates is described.
Multicomponent synthesis of substituted pyridines <i>via</i> a catalytic intermolecular aza-Wittig/Diels–Alder sequence
作者:Mary E. Bayana、J. Steven Wailes、Stephen P. Marsden
DOI:10.1039/d2ra05018h
日期:——
A three-component synthesis of polysubstituted pyridines has been developed, based upon the synthesis of 2-azadienes by a redox-neutral catalytic intermolecular aza-Wittig reaction and their subsequent Diels–Alder reactions. The two-pot process has been demonstrated using a range of aryl and heteroaromatic aldehydes, substituted α,β-unsaturated acids and push–pull enamines, to give rapid access to
Decarboxylative Enamide Synthesis from Carboxylic Acid and Alkenyl Isocyanate
作者:Rui Wang、Wenbo H. Liu
DOI:10.1021/acs.orglett.3c01682
日期:2023.7.21
protocol to access the enamide via employing carboxylic acid and alkenyl isocyanate as the precursors promoted by DMAP without involving any metal catalysts and dehydration reagents. This protocol is simple and practical and tolerates numerous functional groups. Considering the simplicity, the ready availability of both starting materials, and the significance of the enamides, we expect that this reaction