Iron(III) Chloride Catalyzed Synthesis of Functionalized Spiropyrimidines
作者:K. Majumdar、Sudipta Ponra、Tapas Ghosh
DOI:10.1055/s-0033-1338533
日期:——
Potentially bioactive pyrimidine-annulated spiroheterocyclic compounds are synthesized in good to excellent yields using readily available, cheap and environmentally friendly iron(III) chloride (FeCl3) as the catalyst. The process is straightforward and provides a diverse range of spiropyrimidine derivatives via the 5-endo-dig mode of cyclization, starting from simple and easily available starting materials.
Regioselective synthesis of pyrimidine-annulated spiro-dihydrofurans by silver-catalyzed 5-endo-dig cyclization
作者:K. C. Majumdar、Sintu Ganai、Raj Kumar Nandi
DOI:10.1039/c1nj20121b
日期:——
A simple and efficient method for the synthesis of some hitherto unreported pyrimidine-annulated spiro-dihydrofurans has been described. In the presence of AgSbF6 spiro- and furo-pyrimidine (10-hydroxy-4,7,9-substituted-1-oxa-7,9-diazaspiro[4.5]dec-3-ene-6,8-dione) heterocycles are obtained in good yields. The nature of the alkyne moiety present in substrates dictates the mode of cyclization to form the furopyrimidine derivatives.