A simple and efficient automatable one step synthesis of triazolopyridines from carboxylic acids
作者:Ying Wang、Kathy Sarris、Daryl R. Sauer、Stevan W. Djuric
DOI:10.1016/j.tetlet.2007.02.004
日期:2007.3
Triazolopyridines can be rapidly and efficiently synthesized from a variety of carboxylic acids with 2-hydrazinopyridines in one simple step. The use of commercially available PS-PPh3 resin combined with microwave heating delivered the product triazolopyridines in good yields and purities.
Dihalogentriphenylphosphoranes in Heterocyclic Synthesis; 15.<sup>1</sup>A Simple One-Pot-Procedure for the Generation of Nitrilimines with the Aid of Dihalogentriphenyl-phosphoranes: 1,3-Dipolar Cycloadditions and 1,5-Electrocyclizations
作者:Heinrich Wamhoff、Magdy Zahran
DOI:10.1055/s-1987-28108
日期:——
A simple and versatile one-pot procedure for the in situ generation of nitrilimines from N-acyl hydrazines is described. 1,3-Dipolar cycloadditions and 1,5-electrocyclic ring closures are carried out. Unsymmetrically substituted dipolarophiles show typical regioselectivity.