An efficient one-pot synthesis of novel pyrano[3,2-b]pyrazolo[4,3-e]pyridin-8(1H)-ones via three-component condensation of kojic acid, 1-H-pyrazol-5-amines and aldehydes in the presence of a catalytic amount of Zn(OTf)2 followed by H2O2-mediated oxidation is reported. Furthermore, the synthesis of 1′H-spiro[indoline-3,4′-pyrano[2,3-b]pyrazolo[3,4-e]pyridine]-2,8′(9′H)-diones were chosen for the library
通过曲酸,1 - H-吡唑-5-的三组分缩合反应有效地一锅合成新型吡喃并[3,2- b ]吡唑并[4,3 - e ]吡啶-8(1 H)-据报道,在催化量的Zn(OTf)2的存在下,然后在H 2 O 2介导的氧化作用下,胺和醛被氧化。此外,1的合成“ ħ -螺[二氢吲哚-3,4'-吡喃并[2,3- b ]吡唑并[3,4- ë ]吡啶] -2,8-'(9' ħ) -二酮被选择用于库验证。