σ重排的研究:4-芳氧基亚甲基-1,7-二甲基-1,2,3-三氢吡啶基-[3,2 - c ]吡喃-5-酮的合成
摘要:
从N-(1-芳氧基-丁酸酯)制备了许多4- [ N -4'-芳氧基丁-2-炔基N-甲基氨基-6-甲基吡喃-2-酮(4a–g) -2-炔基)-N-甲胺(3)和4-甲苯磺酰氧基-6-甲基-吡喃-2-酮(2)。化合物4(a–g)的热重排得到4-芳氧基-甲基-1,7-二甲基-1,2-二氢吡啶基-[3,2 - c ]吡喃-5-酮(6)和/或4-芳氧基亚甲基-1,7-二甲基-1,2,3-三氢吡啶基-[3,2- c ]吡喃-5-酮(5)。
Regioselective Chlorination and Suzuki-Miyaura Cross-Coupling of 4-Alkoxycoumarins, 4-Alkoxy-2-pyrones, and Related Heterocycles
作者:Aisling M. Prendergast、Gerard P. McGlacken
DOI:10.1002/ejoc.201700837
日期:2017.9.1
The chlorination of biologically important 4-alkoxycoumarins was achieved by using trichloroisocyanuric acid, a favorable alternative to N-chlorosuccinimide. The Suzuki–Miyaura cross-coupling of chlorinated coumarins with various boronic acids afforded the products in up to 99 % yield. This protocol was successfully applied to related 2-pyrone, 2-pyridone, and 2-quinolone derivatives.
N-Heterocyclic Carbene Derived Nickel-Pincer Complexes: Efficient and Applicable Catalysts for Suzuki-Miyaura Coupling Reactions of Aryl/Alkenyl Tosylates and Mesylates
作者:Jun-ichi Kuroda、Kiyofumi Inamoto、Kou Hiroya、Takayuki Doi
DOI:10.1002/ejoc.200900067
日期:2009.5
activities of NHC-derived nickel–pincercomplexes for the Suzuki–Miyauracouplingreactions of aryl/alkenyltosylates and mesylates are described. In the presence of a catalytic amount of nickelacycle 1a, a wide array of tosylates and mesylates reacted with several aryl- and alkenylboronic acids to afford the coupling products, generally in high yields. Fine tuning of the reaction conditions for each class
Optical properties of donor–acceptor phenylene-ethynylene systems containing the 6-methylpyran-2-one group as an acceptor
作者:Jonathan C. Collings、Alexander C. Parsons、Laurent Porrès、Andrew Beeby、Andrei S. Batsanov、Judith A. K. Howard、Donocadh P. Lydon、Paul J. Low、Ian J. S. Fairlamb、Todd B. Marder
DOI:10.1039/b502781k
日期:——
Donorâacceptor phenylene ethynylene systems containing the 6-methylpyran-2-one group, synthesized via classic or microwave-assisted Sonogashira cross-coupling, exhibit pronounced solvatochromism in fluorescence suggesting a highly polar excited state; 4-[4-(4-N,N-dihexylaminophenylethynyl)phenylethynyl]-6-methylpyran-2-one has a fluorescence quantum yield >0.9 in cyclohexane.
Efficient Route to 4-Substituted-2(5<i>H</i>)-furanones, 2(1<i>H</i>)-quinolones, and pyrones by Nickel-catalyzed Cross-coupling of Arenesulfonates with Organozinc Reagents
作者:Jie Wu、Xiaoyu Sun、Liang Zhang
DOI:10.1246/cl.2005.796
日期:2005.6
Nickel(II)-catalyzed cross-coupling reactions of 4-tosyl-2(1H)-quinolone, pyrone, and 2(5H)-furanone with various organozincreagents provide an efficient and practical method for the high-yielding...
Palladium-Catalyzed <i>N</i>-Arylation of Sulfoximines with Aryl Sulfonates
作者:Qingjing Yang、Pui Ying Choy、Qingyang Zhao、Man Pan Leung、Hoi Shan Chan、Chau Ming So、Wing-Tak Wong、Fuk Yee Kwong
DOI:10.1021/acs.joc.8b01599
日期:2018.9.21
Palladium-catalyzed C–N bond coupling reaction between NH-sulfoximines and aryl halides (e.g., −Br, −I, and −Cl and pseudohalides −OTf and −ONf) was successfully achieved. Nevertheless, aryltosylates/mesylates left much to be achieved. In this report, a general N-arylation of sulfoximines with aryl sulfonates is described. Using Pd(OAc)2/MeO-CM-phos complex, the N-aryl sulfoximine products can be