A “one-pot” multicomponent approach to polysubstituted 4-aminopyridines
作者:Jiaan Shao、Wanwan Yu、Zhanying Shao、Yongping Yu
DOI:10.1039/c2cc17850h
日期:——
A novel and facile domino reaction has been developed to synthesize a variety of polysubstituted 4-aminopyridines from α-azidovinylketones, aldehydes and methylamine derivatives in reasonably good yields under mild conditions. Additionally, a possible mechanism is proposed.
A simple protocol to prepare the privileged 2‐aminothiazoles promoted by ferrous sulfate heptahydrate via CN bond formation from vinylazides and commercially available potassium thiocyanate has been developed. A wide range of vinylazides are tolerated to afford the expected polysubstituted 2‐aminothiazoles in reasonably good yields. The use of the non‐toxic substrates and catalyst renders the reaction
Facile preparation of 3,5-disubstituted-4-aminothiophene-2-carbaldehyde from a novel unexpected domino reaction of vinyl azides and 1,4-dithiane-2,5-diol
A facile approach to provide 3,5-disubstituted-4-aminothiophene-2-carbaldehyde containing both the amino group and the aldehyde group has been developed.
A novel and efficient reaction of vinyl azides with Bestmann-Ohira reagent for the regioselectivesynthesis of phosphonylpyrazoles is presented. Reaction proceeds through 1, 3 dipolar cycloaddition with an excellent yield in short period of time under mild reaction conditions. Moreover, no column purification is involved for the isolation of products.
Unexpected Synthesis of 2,4,5-Trisubstituted Oxazoles via a Tandem Aza-Wittig/Michael/Isomerization Reaction of Vinyliminophosphorane
作者:Hai Xie、Ding Yuan、Ming-Wu Ding
DOI:10.1021/jo202588j
日期:2012.3.16
2 4,5-Trisubstituted oxazoles 6 were unexpectedly prepared from a tandem reaction of vinyliminophosphorane 3 with various acyl chlorides in a one-pot fashion.