An alternative approach to the synthesis of 5H-chromeno[4,3-b]pyridin-5-one system using the cleavage of 5H,9H-pyrano[2',3':5,6]chromeno[4,3-b]pyridine-5,9-diones with binucleophiles
作者:Oleg A. Lozinski、Tatyana V. Shokol、Roman I. Zubatyuk、Oleg V. Shishkin、Volodymir P. Khilya
DOI:10.1007/s10593-018-2238-6
日期:2018.1
Hantzsch reaction has been successfully employed for a one-step assembling of pyranopyridine fragment to produce 5Н,9Н-pyrano[2',3':5,6]- chromeno[4,3-b]pyridine-5,9-diones which upon treatment with binucleophiles undergo chemoselective γ-pyrone ring opening with the concomitant recyclization to give five-membered cycles, providing a concise route to 6-pyrazolyl(isoxazolyl)-5H-chromeno[4,3-b]- pyridin-5-ones
汉奇反应已经成功地用于单步骤组装吡喃并吡啶片段,以产生5 Н,9 Н吡喃并[2' ,3' :5,6] -色烯并[4,3- b ]吡啶-5,9-用二亲核试剂处理的二酮经过化学选择性的γ-吡喃酮开环,并伴随有环化反应,形成五元环,为生成6-吡唑基(异恶唑基)-5 H -chromeno [4,3- b ]-吡啶- 5个。