New uses of Westphal condensation: Synthesis of flavocorylene and related indolo[2,3-a]quinolizinium salts.
作者:María P. Matia、Jesús Ezquerra、José L. García-Navío、Juan J. Vaquero、Julio Alvarez-Builla
DOI:10.1016/0040-4039(91)80538-h
日期:1991.12
Using the Westphal condensation, flavocorylene and related Indolo[2,3-a]quinolizinium salts have been prepared in two steps, starting from commercially available beta-carboline derivatives.
Optimized Synthesis of Di, Tri and Tetrafused Pyridazinium Cations
作者:Jorge Siró、Andrés Ramos、Juan J Vaquero、Julio Alvarez-Builla、José L Garcı́a-Navı́o
DOI:10.1016/s0040-4020(00)00079-x
日期:2000.4
By combining two complementary statistical techniques (fractional factorial experimental design and simplex operation) the synthesis of the parent pyrido[1,2-b]-pyridazinium cation has been successfully carried out (the yield was improved from less than 10 to 65%) by basic condensation of 2-methyl-1-aminopyridinium mesitylenesulfonate and [1,4]dioxane-2,3-diol, Using the optimized reaction conditions, other related heterocyclic cations could be prepared, and two interesting examples are now reported. (C) 2000 Elsevier Science Ltd. All rights reserved.