Copper-Catalyzed Oxidative [3 + 2] Cycloaddition of <i>N</i>-Alkyl Pyridinium Salts to Imidazo[1,2-<i>a</i>]pyridines
作者:Yuan Zhang、Weibin Fan、Yinghua Li、Deguang Huang
DOI:10.1021/acs.joc.3c00728
日期:2023.9.1
A copper-catalyzed reaction of pyridiniumsalts and trimethylsilyl cyanide (TMSCN) in the presence of diethyl phosphite is developed. This reaction, which allows the single-step construction of biologically important 2-cyanoimidazo[1,2-a]pyridine from readily available starting materials, is realized for the first time and is feasible at the gram scale. The scope of the protocol is demonstrated with
开发了在亚磷酸二乙酯存在下吡啶鎓盐和三甲基硅烷基氰化物 (TMSCN) 的铜催化反应。该反应首次实现了从容易获得的起始材料一步构建生物学上重要的2-氰基咪唑并[1,2- a ]吡啶的反应,并且在克级是可行的。该协议的范围通过 27 个示例进行了演示。在这一一锅法中可以实现连续的双氰化和环化。TMSCN 发挥双重作用,不仅作为“CN”源,而且作为咪唑并[1,2- a ]吡啶环化的偶联伙伴。
Paglietti, Giuseppe; Sanna, Paolo; Nuvole, Antonio, Journal of Chemical Research, Miniprint, 1983, # 10, p. 2326 - 2342
作者:Paglietti, Giuseppe、Sanna, Paolo、Nuvole, Antonio、Soccolini, Francesco、Acheson, R. Morrin
DOI:——
日期:——
PAGLIETTI, G.;SANNA, P.;NUVOLE, A.;SOCCOLINI, F.;ACHESON, R. M., J. CHEM. RES. MICROFICHE, 1983, N 10, 245
作者:PAGLIETTI, G.、SANNA, P.、NUVOLE, A.、SOCCOLINI, F.、ACHESON, R. M.
DOI:——
日期:——
Metal-free reduction of unsaturated carbonyls, quinones, and pyridinium salts with tetrahydroxydiboron/water
A series of unsaturated carbonyls, quinones, and pyridinium salts have been effectively reduced to the corresponding saturated carbonyls, dihydroxybenzenes, and hydropyridines in moderate to high yields with tetrahydroxydiboron/water as a mild, convenient, and metal-free reduction system. Deuterium-labeling experiments have revealed this protocol to be an exclusive transfer hydrogenation process from
Gold(I)‐Catalyzed Nucleophilic Allylation of Azinium Ions with Allylboronates
作者:Luke O'Brien、Stephen P. Argent、Kristaps Ermanis、Hon Wai Lam
DOI:10.1002/anie.202202305
日期:2022.5.23
Gold(I)-catalyzed nucleophilic allylations of pyridinium and quinolinium ions with allylboronates are reported. Transmetalation of the allylboronate with gold produces nucleophilic allylgold(I) species that add to the 4-position of the azinium ion with complete regioselectivity to give functionalized 1,4-dihydropyridines and 1,4-dihydroquinolines. Density functional theory (DFT) calculations provided