Harnessing Cascade Suzuki-Cyclization Reactions of Pyrazolo[3,4-<i>b</i>]pyridine for the Synthesis of Tetracyclic Fused Heteroaromatics
作者:Hubert Lavrard、Florence Popowycz
DOI:10.1002/ejoc.201601242
日期:2017.1.18
Numerous procedures have been described for the functionalization of pyrazolo[3,4-b]pyridine, mainly nucleophilic substitutions on C-4 position and esterifications/amidations on C-5 position. Thus, we report herein a robust, easy to implement protocol for the Suzuki cross-coupling reaction of the chloroarene 2, followed by in situ lactonisation to provide chromenopyrazolopyridines. The extension of