ω-Functionalized 3-Alkynylpyrazolo[1, 5<i>-a</i>]pyrimidines by Sonogashira Coupling
作者:Jürgen Liebscher、Lunxiang Yin
DOI:10.1055/s-2004-834923
日期:——
Ï-Functionalized 3-alkynylpyrazolo[1,5-a]pyrimidines were synthesized via the Pd-C/CuI/PPh3-catalyzed Sonogashira coupling of 3-iodopyrazolo[1,5-a]pyrimidines with propargylic and homopropargylic compounds. Subsequent Pd-C-catalyzed hydrogenation of the C-C triple bond afforded 3-(3-dimethylaminopropyl)-pyrazolo[1,5-a]pyrimidines.
α-功能化的3-炔基吡唑并[1,5-a]嘧啶通过3-碘吡唑并[1,5-a]嘧啶与丙炔基和同丙炔基化合物在Pd-C/CuI/PPh3催化下的Sonogashira偶联反应合成。随后通过Pd-C催化的C-C三键氢化得到3-(3-二甲氨基丙基)吡唑并[1,5-a]嘧啶。