The present invention is related to chemical compositions, processes for the preparation thereof and uses of the composition. Particularly, the present invention relates to compositions that include substituted heterobicyclic pyrimidines of Formula (I):
wherein R
1
, R
2
, R
3
, R
4
, R
5
, X, W, and ring A are as defined herein; pharmaceutical compositions of substituted heterobicyclic pyrimidines of Formula (I); and their use in the treatment of chronic neurodegenerative diseases, neurotraumatic diseases, depression and/or diabetes. More particularly, the present invention relates to substituted pyrazolopyrimidines of Formula (I).
dicarbonyl(η5-cyclopentadienyl) (η1-2-mthoxyallyl)iron (I) together with cyclic phosphite. This complex II was reacted with various electron deficient olefins to yield the corresponding cyclopentenyl-Fp adducts. In these reactions complex II was found to be more reactive and more selective in formation of cyclicadducts when compared to I. High yields of cyclicadducts were obtained exclusively in reactions of II
two rings in one step. The reaction features operational simplicity, broad substrate scope (>70 examples), good functional group compatibility, and the suitability to derivation of some bioactive molecules. Various control and kinetic isotope effect experiments were performed to understand the reaction mechanism. DFT investigations support an interesting imine α-carbon radical addition/1,5-hydrogen atom
一步实现顺序和可控的 C-H 功能化可以最大限度地利用 C-H 键,快速创建有价值的支架,并显着提高原子和官能团的利用率。在这项工作中,我们描述了一种铁催化的中继 C-H 功能化方案,该方案能够从头合成各种吡啶和吡啶酮。这种转化涉及三重 C–H 功能化(两个 C sp 3 –H 和一个 C sp 2–H) 并允许一步同时生成三个化学键和两个环。该反应具有操作简单、底物范围广(>70个例子)、良好的官能团相容性以及适合衍生一些生物活性分子的特点。进行了各种控制和动力学同位素效应实验以了解反应机理。DFT 研究支持有趣的亚胺 α-碳自由基加成/1,5-氢原子转移/均裂芳香取代级联过程。
Synthesis of di/trifluoromethyl cyclopropane-dicarbonitriles <i>via</i> [2+1] annulation of fluoro-based diazoethanes with (alkylidene)malononitriles
作者:Cheng-Feng Gao、Yue-Ji Chen、Jing Nie、Fa-Guang Zhang、Chi Wai Cheung、Jun-An Ma
DOI:10.1039/d3cc03897a
日期:——
Herein, we describe a [2+1] annulation reaction of di/trifluorodiazoethane with (alkylidene)malononitriles. This protocol offers a streamlined synthesis of a wide range of stereospecific and densely functionalized difluoromethyl and trifluoromethyl cyclopropane-1,1-dicarbonitriles. Further functional group interconversions or skeletal elaborations afford structurally distinct cyclopropyl variants.