A mild method for the conversion of activated aryl methyl groups to carboxaldehydes via the uncatalyzed periodate cleavage of enamines
摘要:
A mild procedure for the oxidative cleavage of aryl enamines to aryl aldehydes by periodate without the need for transition metal catalysis is presented.
carbons in 4-(N,N-dimethylamino)-4′-nitrobiphenyl indicate that atoms of the p,p-biphenylene spacer also gain some charge originating from the amino nitrogen. 3 J H,H spin–spincoupling constant shows that among different vinylene compounds, the charge transfer to the nitro group is practically effective only in N,N-dimethyl-2-nitroethenamine where the bond between the vinylene carbons is significantly
1 H,13 C,15 N和17 O NMR化学位移用于表征Me 2 N-G-NO 2类型的几种硝胺中的分子内相互作用。电荷孤电子对中的氨基的Ñ,Ñ -dimethylnitramine,Ñ,Ñ二甲基-2- nitroethenamine,Ñ,Ñ二甲基p硝基苯胺,4-硝基- β二甲基氨基苯乙烯,4- Ñ,Ñ -二甲基氨基-β-硝基苯乙烯,4-(N,N-二甲基氨基)-4'-硝基联苯和4-(N,N-二甲基氨基)-4′-亚硝基二苯乙烯不仅转移到硝基氧上,而且转移到G间隔基的亚乙烯基和苯碳上,也转移到N-甲基碳上。发现减少的核屏蔽在质量上与核周围原子电荷的减少有关。通过将NMR数据与从头算量子化学计算获得的结果进行比较,进一步证实和量化了这一发现。当相互作用的NMe 2和NO 2基团被短的间隔基隔开时,17 O NMR化学位移变化似乎更为明显。另一方面,15N NMR化学位移表明,氨基氮上电荷的减少与间隔基的长度无关。在17
An Efficient One-Step Method for the Conversion of β-(Dimethylamino)styrenes into Arylacetonitriles
作者:Alexey M. Starosotnikov、Alexander V. Lobach、Svyatoslav A. Shevelev
DOI:10.1055/s-2005-918405
日期:——
A new simple and efficient one-step method for the preparation of arylacetonitriles by reaction of β-(dimethylamino)styrenes with hydroxylamine hydrochloride in formic acid solution is described.
介绍了一种简便高效的一步法,通过β-(二甲氨基)苯乙烯与盐酸羟胺在甲酸溶液中的反应来制备苯乙腈。
Enamines in Heterocyclic Synthesis: A Route to 4-Substituted Pyrazoles and Condensed Pyrazoles
作者:Huwaida M. E. Hassaneen、Hamdi M. Hassaneen、Mohamed H. Elnagdi
DOI:10.1515/znb-2004-1009
日期:2004.10.1
Abstract
The reaction of nitrile imines, generated in situ, from hydrazonoyl halides 3a - e with enamines 2a - c affords pyrazoles 8a - g. These pyrazoles have been used to prepare condensed pyrazoles.
Studies with enamines: Reactivity of<i>N,N</i>-dimethyl-<i>N</i>-[(<i>E</i>)-2-(4-nitrophenyl)-1-ethenyl]amine towards nitrilimine and aromatic diazonium salts
作者:Hamad M. Al-Matar、Sayed M. Riyadh、Mohamed H. Elnagdi
DOI:10.1002/jhet.5570440315
日期:2007.5
In the presence of triethylamine, cycloaddition reaction of enamine 1 with hydrazonoyl halides 2 followed by dimethylamine elimination was achieved, yielding the corresponding 1,3,4-trisubstituted pyrazoles 4. Coupling of enamine 1 with aromaticdiazoniumsalts afforded 2-(arylhydrazono)-2-(4-nitrophenyl)acetaldehyde 9 in good yield. Refluxing the phenyl hydrazone 9a with chloroacetone in ethanol in
Surmounting the resistance against EGFR inhibitors through the development of thieno[2,3-d]pyrimidine-based dual EGFR/HER2 inhibitors
作者:Sandra N. Milik、Amal Kamal Abdel-Aziz、Deena S. Lasheen、Rabah A.T. Serya、Saverio Minucci、Khaled A.M. Abouzid
DOI:10.1016/j.ejmech.2018.06.011
日期:2018.7
In light of the emergence of resistance against the currently available EGFR inhibitors, our study focuses on tackling this problem through the development of dual EGFR/HER2 inhibitors with improved enzymatic affinities. Guided by the binding mode of the marketed dual EGFR/HER2 inhibitor, Lapatinib, we proposed the design of dual EGFR/HER2 inhibitors based on the 6-phenylthieno[2,3-d]pyrimidine as a core scaffold and hinge binder. After two cycles of screening aiming to identify the optimum aniline headgroup and solubilizing group, we eventually identified 27b as a dual EGFR/HER2 inhibitor with IC50 values of 91.7 nM and 1.2 mu M, respectively. Notably, 27b dramatically reduced the viability of various patient-derived cancer cells preferentially overexpressing EGFR/HER2 (A431, MDA-MBA-361 and SKBr3 with IC50 values of 1.45, 3.5 and 4.83 mu M, respectively). Additionally, 27b efficiently thwarted the proliferation of lapatinib-resistant human non-small lung carcinoma (NCI-H1975) cells, harboring T790 M mutation, with IC50 of 4.2 mu M. Consistently, 27b significantly blocked EGF-induced EGFR activation and inactivated its downstream AKT/mTOR/S6 signalling pathway triggering apoptotic cell death in NCI-H1975 cells. The present study presents a promising candidate for further design and development of novel EGFR/HER2 inhibitors capable of overcoming EGFR TKIs resistance. (C) 2018 Elsevier Masson SAS. All rights reserved.