Iodine‐Promoted Synthesis of Dipyrazolo/Diuracil‐Fused Pyridines and
<i>o</i>
‐Amino Diheteroaryl ketones via Oxidative Domino Annulation of 2/4‐Methylazaarenes
4-b:4′,3′-e]pyridines (BPPs), diuracilpyridines and o-amino diheteroaryl ketones. The domino procedure proceeded with easily available methyl azaarenes, 5-aminouracils and substituted 5-aminopyrazoles. This protocol is a simple and metal-free approach which exhibits high functional group compatibility and broad substrates scope. Moreover, this transformation can be applied for the preparation of dipyr
碘促进的氧化多米诺环化和羰基化过程已被开发用于合成具有生物学意义的氮杂芳烃取代的双吡唑并[3,4- b :4',3'- e ]吡啶(BPPs)、双尿嘧啶和邻氨基二杂芳基酮。多米诺程序使用易于获得的甲基氮杂芳烃、5-氨基尿嘧啶和取代的 5-氨基吡唑进行。该协议是一种简单且无金属的方法,具有高官能团兼容性和广泛的底物范围。此外,这种转化可用于制备克级联吡唑并/双尿嘧啶稠合的吡啶。
One-Pot Acid-Promoted Synthesis of 6-Aminopyrazolopyrimidines from 1<i>H</i>-Pyrazol-5-yl-<i>N</i>,<i>N</i>-dimethylformamidines or 5-Amino-1<i>H</i>-pyrazole-4-carbaldehydes with Cyanamide
作者:Ching-Chun Tseng、Shuo-En Tsai、Sin-Min Li、Fung Fuh Wong
DOI:10.1021/acs.joc.9b02653
日期:2019.12.20
acid-promoted synthesis of 6-aminopyrazolo[3,4-d]pyrimidine has been developed by treatment of 1H-pyrazol-5-yl-N,N-dimethylformamidines or 5-amino-1H-pyrazole-4-carbaldehydes with cyanamide (NH2C≡N) in an acid-mediated solution. This syntheticroute involves four steps of deprotection, imination, the key acid-promoted heterocyclization, and aromatization. On the basis of optimized studies, methanesulfonylchloride
Visible Light-Mediated C(sp<sup>2</sup>)–H Selenylation of Amino Pyrazole and Amino Uracils in the Presence of Rose Bengal as an Organophotocatalyst
作者:Danish Ali、Tasneem Parvin、Lokman H. Choudhury
DOI:10.1021/acs.joc.1c02565
日期:2022.1.21
arylselenoethers by a catalyst-free one-pot three-component reaction. The notable features of this methodology are metal-free reaction conditions, good to very good yields, use of an organic photocatalyst, and wide substrate scope; it is also applicable to gram-scale synthesis and provides selenoethers of medicinally important heterocycles such amio-pyrazole, isoxazole, isothiazole, and uracils.
solvent (NDDES) in organic synthesis has received more and more attention. In this work, a green protocol for one-pot synthesis of spiro[indoline-3,4′-pyrazolo[3,4-b]pyridines] via three-componentreactions of 1H-pyrazol-5-amin, isatin and enolizable CH activated compound is achieved by the combination of microwave irradiation with choline chloride and lactic acidbased NDDES. This novel method is
天然共晶溶剂(NDDES)在有机合成中的应用受到越来越多的关注。在这项工作中,通过1 H-吡唑-5-氨基,靛红和烯醇化的三组分反应,一锅法合成螺[吲哚啉-3,4'-吡唑并[3,4- b ]吡啶]的绿色方案通过结合氯化胆碱和乳酸的NDDES进行微波辐射,可以实现C H活化的化合物。这种新颖的方法清洁,便宜,简单,产率高,无色谱且可扩展。氯化胆碱和乳酸作为可生物降解,可循环使用和可重复使用的介质的使用符合大多数被认为是可持续的和对环境有益的过程的标准。
Synthesis, characterization and application of magnetic biochar sulfonic acid as a highly efficient recyclable catalyst for preparation of spiro-pyrazolo[3,4-b]pyridines
microscope, transmission electron microscope and vibrating sample magnetometer techniques. The prepared catalyst exhibited excellent catalytic activity for synthesis of spiro-pyrazolo[3,4-b]pyridine derivatives via one-potthree-componentreaction of 1H-pyrazol-5-amine, isatin and 3-oxo-3-phenylpropanenitrile. The catalyst could be readily recovered and reused several times without an obvious decay of
采用傅里叶红外光谱(FT-IR)、粉末X射线衍射技术、扫描电镜、透射电镜和振动样品磁强计技术制备磁性生物炭磺酸并对其进行表征。制备的催化剂对1 H-吡唑-5-胺、靛红和3-氧代-3-苯基丙腈的一锅三组分反应合成螺吡唑并[3,4- b ]吡啶衍生物表现出优异的催化活性。该催化剂可以很容易地回收和多次重复使用,而催化性能没有明显下降。