Palladium-catalyzed one-pot synthesis of benzo[b][1,6]naphthyridines via Sonogashira coupling and annulation reactions from 2-chloroquinoline-3-carbonitriles
作者:Radhey M. Singh、Ritush Kumar、Neha Sharma、Mrityunjaya Asthana
DOI:10.1016/j.tet.2013.08.072
日期:2013.11
Palladium-catalyzed one-pot synthesis of 1,3-disubstituted benzo[b][1,6]naphthyridines and [1,6]naphthyridines has been described from easily accessible precursors, 2-chloroquinoline-3-carbonitriles and 2-chloropyrido-3-carbonitrile via sequential additions of palladium-catalyst for Sonogashira-coupling and the following annulations in good to excellent yields. A plausible mechanism for annulation
的钯-催化的一锅合成1,3-二取代苯并[ b ] [1,6]萘啶和[1,6]萘啶已经从容易获得的前体,2-氯喹啉-3-腈和所述的2- chloropyrido-通过依次添加钯催化剂进行Sonogashira偶联,以及随后的环化反应,可制得3-腈,收率良好。讨论了一种可行的圆环化机制。