Conversion of Aryl Aldehydes to Benzyl Iodides and Diarylmethanes by H<sub>3</sub>PO<sub>3</sub>/I<sub>2</sub>
作者:Fang Lv、Jing Xiao、Junchun Xiang、Fengzhe Guo、Zi-Long Tang、Li-Biao Han
DOI:10.1021/acs.joc.0c02850
日期:2021.2.5
reductive benzylation reactions with aryl aldehydes. By using a H3PO3/I2 combination, various aromaticaldehydes underwent iodination reactions and Friedel–Crafts typereactions with arenes via benzyl iodide intermediates, readily producing benzyl iodides and diarylmethanes in good yields. Intramolecular cyclization reactions also took place, giving the corresponding cyclic compounds. This new strategy features
在与芳基醛的苄基还原反应中,H 3 PO 3首次被用作还原剂和促进剂。通过使用H 3 PO 3 / I 2组合,各种芳族醛经过苄基碘中间体与芳烃进行碘化反应和Friedel-Crafts型反应,可轻松以高收率生产苄基碘和二芳基甲烷。分子内环化反应也发生,得到相应的环状化合物。这种新策略具有易于处理,低成本和无金属的条件。
Iminophosphorane-mediated regioselective umpolung alkylation reaction of α-iminoesters
Umpolung reactions of imines, especially the asymmetric reactions, have been extensively studied as they provide access to important chiral amines in an efficient manner. The reactions studied range from simple Michael reactions to several kinds of other reactions such as the aza-benzoin reaction, aza-Stetter reaction, addition with MBH carbonate, and Ir-catalysed allylation. Herein, we report the
Investigations on the 4-quinolone-3-carboxylic acid motif. 6. Synthesis and pharmacological evaluation of 7-substituted quinolone-3-carboxamide derivatives as high affinity ligands for cannabinoid receptors
作者:Serena Pasquini、Maria De Rosa、Alessia Ligresti、Claudia Mugnaini、Antonella Brizzi、Nicola P. Caradonna、Maria Grazia Cascio、Daniele Bolognini、Roger G. Pertwee、Vincenzo Di Marzo、Federico Corelli
DOI:10.1016/j.ejmech.2012.09.035
日期:2012.12
synthesized and evaluated for their binding ability to cannabinoid type 1 (CB1) and type 2 (CB2) receptors. Most of the compounds showed affinity for one or both cannabinoid receptors at nanomolar concentration, with Ki(CB1) and Ki(CB2) values ranging from 2.45 to >10,000 nM and from 0.09 to 957 nM, respectively. The N-(3,4-dichlorobenzyl)amide derivatives 27 and 40 displayed relatively low affinity, but high
Highly Enantioselective Copper-Catalyzed Alkylation of β-Ketoesters and Subsequent Cyclization to Spirolactones/Bi-spirolactones
作者:Qing-Hai Deng、Hubert Wadepohl、Lutz H. Gade
DOI:10.1021/ja211859w
日期:2012.2.15
Cu-catalyzed enantioselective alkylation of β-ketoesters using alcohols for in situ preparation of alkylating reagents is reported. A number of functionalized β-ketoesters containing a quaternary carbon stereocenter are obtained with up to 99% ee. The alkylation products derived from 2-substituted allylic alcohols or their corresponding iodides can then be converted to spirolactones, bi-spirolactones
报道了使用醇对 β-酮酯进行 Cu 催化的对映选择性烷基化,用于原位制备烷基化试剂。获得了许多含有季碳立体中心的官能化 β-酮酯,ee 高达 99%。然后可以将衍生自 2-取代烯丙醇或其相应碘化物的烷基化产物转化为螺内酯、双螺内酯和相关的手性目标产物。
Homolytic displacement at carbon
作者:Martyn R. Ashcroft、Peter Bougeard、Adrian Bury、Christopher J. Cooksey、Michael D. Johnson
DOI:10.1016/0022-328x(85)87417-9
日期:1985.7
homolysis of the substrate, abstracts iodine from the toluenesulphonyl iodide to give the toluenesulphonyl radical, which attacks the organic ligand of the cobaloxime, preferably at the terminal olefinic carbon, thereby displacing cobaloxime(II) and giving the observed organic product.