CO2 and water are the only byproducts of this process, and the reaction conditions can scale up to gram quantities. The transformation involves an unprecedented tBuOK-catalyzed domino process, and features Michael addition/6π-electrocyclic ring opening/[1,5]-H shift/carba-6π-electrocyclic ring closure/decarboxylative aromatization reactions.
new methodology for the synthesis of fluorinated and non‐fluorinated 1H‐pyrazolo[3,4‐b]pyridin‐3‐ones was developed. The reactions proceed by cyclization of electron‐rich 3‐amino‐1H‐pyrazol‐5(4H)‐ones with 1,3‐diketones and the products were obtained in good to excellent yields and with excellent regioselectivity. The products, which can be regarded as deazapurine analogues, were tested for the alkaline
为氟化和非氟化的1的合成的新方法ħ -吡唑并[3,4- b ]吡啶-3-酮被开发。反应是通过将富含电子的3-氨基-1 H-吡唑-5(4 H)-1与1,3-二酮环化而进行的,所获得的产物具有良好的产率和极好的区域选择性。该产品可被视为脱氮嘌呤类似物,已测试了碱性磷酸酶(h- TNAP和h- IAP)和核苷酸焦磷酸酶/磷酸二酯酶(h- NPP1和h‐NPP3)抑制曲线。大多数衍生物对组织非特异性和肠道碱性磷酸酶和核苷酸焦磷酸酶(NPP1和NPP3)酶表现出选择性和有效的抑制作用。通过分子对接分析研究了最有效抑制剂的可能结合方式。
Synthesis of Functionalized Cyclobutenes and Spirocycles
<i>via</i>
Asymmetric P(III)/P(V) Redox Catalysis
phosphine-catalyzed transformation has been developed for the synthesis of chiral cyclobutene triesters and fluorinated spirocyclic compounds. The strategy involved a P(III)/P(V) redox cycling process, via in situ reduction of phosphine oxide with phenylsilane. This catalytic methodology has enabled the enantioselective synthesis of functionalized cyclobutenes (24 examples, up to 94% ee). On the occasion of the
Compounds, compositions and methods for modulating the activity of nuclear receptors are provided. In particular, heterocyclic compounds are provided for modulating the activity of nuclear receptors, including liver X receptor (LXR) and orphan nuclear receptors. In certain embodiments, the compounds are N-substituted pyridones.
Synthesis of glycosides of 1H-Pyrazolo[3,4-b]pyridin-3(2H)-ones
作者:Linda Supe、Martin Hein、Viktor O. Iaroshenko、Alexander Villinger、Peter Langer
DOI:10.1016/j.tet.2020.131522
日期:2020.10
A number of new fluorinated and non-fluorinated glycosides of 1H-pyrazolo[3,4-b]pyridin-3(2H)-ones were synthesized by direct attachment of the carbohydrate moiety to the heterocycle using the silyl Hilbert-Jones glycosylationmethod. The products were obtained in good to excellent yields and with very good anomeric stereoselectivity. The starting 1H-pyrazolo[3,4-b]pyridin-3(2H)-ones were prepared
通过使用甲硅烷基希尔伯特-琼斯糖基化将碳水化合物部分直接连接到杂环上,合成了许多1 H-吡唑并[3,4- b ]吡啶3(2 H)-的新的氟化和非氟化糖苷方法。获得的产物具有良好的产率至优异的产率以及非常好的异头立体选择性。起始的1 H-吡唑并[3,4- b ]吡啶-3(2 H)-是通过1,3-二羰基化合物与含有烯胺官能团的富电子杂环的区域选择性环化制备的。