Synthesis of 5-alkyl-5-aryl-1-pyrroline N-oxides from 1-aryl-substituted nitroalkanes and acrolein via Michael addition and nitro reductive cyclization
作者:Jingjing Xu、Xingyao Li、Jinlong Wu、Wei-Min Dai
DOI:10.1016/j.tet.2014.07.046
日期:2014.9
A general method for accessing 5-alkyl-5-aryl-1-pyrroline N-oxides (AAPOs) has been established using readily available aryl bromides, nitroalkanes, and acrolein as the starting materials. The palladium-catalyzed arylation of nitroalkanes gave the 1-aryl-substituted nitroalkanes, which underwent the Et3N-catalyzed Michael addition with acrolein at room temperature to afford the 4-aryl-4-nitroaldehydes
The nitration of substituted ethylbenzenes and substituted biphenyls
作者:AH Clemens、MP Hartshorn、KE Richards、GJ Wright
DOI:10.1071/ch9770103
日期:——
Nitration occurs ipso to
the ethyl group for p-ethyltoluene, p- diethylbenzene and ethylmesitylene. No
evidence was found for ipso- nitration for 2,4,6-trimethyl-, 4-methoxy-,
4-bromo- and 2,2',4,4',6,6'-hexamethoxy-biphenyls.
[Problem]
A pharmaceutical composition for treating or preventing various cardiovascular diseases, which have sGC activities based on improvement of cGMP signals, is provided.
[Means for Solution]
It was found that imidazo[1,2-a]pyridine compounds having a carbamoyl group at the 3-position and a particular cyclic group at the 8-position via a methyleneoxy group, or a salt thereof have sGC activation, and are useful as active ingredients of pharmaceutical compositions for treating or preventing various sGC-related cardiovascular diseases, in particular, peripheral arterial diseases, intermittent claudication, critical limb ischemia, hypertension, and pulmonary hypertension, thereby completing the present invention.
Micelle-Enabled Palladium Catalysis for Convenient sp<sup>2</sup>-sp<sup>3</sup> Coupling of Nitroalkanes with Aryl Bromides in Water Under Mild Conditions
作者:Jeremy Brals、Justin D. Smith、Faisal Ibrahim、Fabrice Gallou、Sachin Handa
DOI:10.1021/acscatal.7b02663
日期:2017.10.6
demonstrated with the palladium-catalyzed sp2-sp3 coupling of nitroalkanes to aryl bromides using a heteroleptic palladium catalyst under unprecedentedly mild conditions. Optimized reaction conditions mostly provided good yields up to gram scale, with high selectivity and functional group tolerance for a wide scope of aryl bromides. Use of surfactant FI-750-M makes water the gross reaction medium and enables
An asymmetric sp3–sp3 cross-electrophile coupling using ‘ene’-reductases
作者:Haigen Fu、Jingzhe Cao、Tianzhang Qiao、Yuyin Qi、Simon J. Charnock、Samuel Garfinkle、Todd K. Hyster
DOI:10.1038/s41586-022-05167-1
日期:2022.10.13
XEC between alkyl halides and nitroalkanes catalyzed by flavin-dependent ‘ene’-reductases. Photoexcitation of the enzyme-templated charge-transfer complex between an alkyl halide and flavin cofactor enables the chemoselective reduction of alkyl halide over the thermodynamically favored nitroalkane partner. The key C–C bond-forming step occurs via the reaction of an alkyl radical with an in situ generated