Synthesis and X-ray Characterization of Alkali Metal 2-Acyl-1,1,3,3-tetracyanopropenides
作者:Sergey V. Karpov、Arthur A. Grigor’ev、Yakov S. Kayukov、Irina V. Karpova、Oleg E. Nasakin、Victor A. Tafeenko
DOI:10.1021/acs.joc.6b01040
日期:2016.8.5
A novel route for synthesis of 2-acyl-1,1,3,3-tetracyanopropenides (ATCN) salts in high yields and excellent purities starting from readily available methyl ketones, malononitrile, bromine, and alkali metal acetates is reported. The starting aryl(heteroaryl) methyl ketones were oxidized to the corresponding α-ketoaldehydes by new a DMSO–NaBr–H2SO4 oxidation system in yields up to 90% within a short
从容易获得的甲基酮,丙二腈,溴和碱金属乙酸盐开始,报道了一种以高收率和优良纯度合成2-酰基-1,1,1,3,3-四氰基丙烯盐(ATCN)盐的新颖途径。新型DMSO–NaBr–H 2 SO 4将起始的芳基(杂芳基)甲基酮氧化为相应的α-酮醛在8-10分钟的短时间内,氧化系统的收率高达90%。根据“绿色化学”的原则5,ATCN的后续制备过程可在水性介质中完成,无需使用任何有毒溶剂。通过X射线衍射分析表征2-苯甲酰基-1,1,3,3-四氰基丙烯腈中的锂,钠,钾,和铯。这些盐显示出合成五元和六元杂环的良好潜力,并且可以在配位和超分子化学中用作潜在有用的配体。
Naphthol synthesis: annulation of nitrones with alkynes via rhodium(<scp>iii</scp>)-catalyzed C–H activation
作者:Qiang Wang、Youwei Xu、Xifa Yang、Yunyun Li、Xingwei Li
DOI:10.1039/c7cc05000c
日期:——
An efficient and redox-neutral naphthol synthesis has been realized via rhodium(III) catalyzed C-Hactivation of alpha-carbonyl nitrones and annulation with alkynes, where the nitrone group functioned as a traceless directing group.
Preparation of Trifluoromethyl-Substituted Aziridines with in Situ Generated CF<sub>3</sub>CHN<sub>2</sub>
作者:Stefan A. Künzi、Bill Morandi、Erick M. Carreira
DOI:10.1021/ol300539e
日期:2012.4.6
Direct access to trifluoromethyl-substituted aziridines through the use of a protocol in which trifluoromethyl diazomethane is generated in situ and subsequently undergoes addition to activated imines is reported.
Synthesis of 7-hydroxy-6,7-dihydro-indole and 6′,7′-dihydro-3,7′-biindole derivatives from domino reactions of arylglyoxals or methyl ketones with enamines
作者:Xin-Mou Lu、Zhong-Jian Cai、Jian Li、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1039/c5ra09478j
日期:——
successfully synthesized in moderate to good yields by the dominoreactions of different arylglyoxals 1 with enamines 2 under catalyst-free conditions. 7-Hydroxy-2-aryl-6,7-dihydro-indol-4(5H)-ones 3 could also be prepared in moderate yields by the iodine-promoted one pot-two step reactions of methyl ketones 6 with enamines 2. The reaction of 3a with N-methyl indole 7a in the presence of PTSA afforded
A highly regioselective N-1 and C-2 diacylation of 3-substituted indoles with arylglyoxal hydrates to afford N-1 and C-2 indolyl diketones in moderate to good yields is described. Notably, the control of regioselectivity is achieved by small changes in the Cu catalyst, additive and solvent. Importantly, the intermediates for N-1 and C-2 diacylation were detected and two plausible pathways were also