我们描述了一系列的1-芳基-2,3-二烷基-1,4,5,6-四氢嘧啶盐1的合成,通过烷基化相应的1,4,5,6-四氢嘧啶2。我们分析了质子化和季铵化诱导的化合物2在1 H和13 C NMR光谱中的变化。提出了对am 2a进行从头算理论研究的结果,以及由其质子化(2aH +)和季铵化(la +)产生的阳离子。发现13之间有定性相关质子化情况下的13 C NMR和理论数据。还讨论了取代图形在化合物1的1 H和13 C NMR光谱中的影响。
A Convenient Synthesis of Unsymmetrical N,N′-Disubstitutedα,ω-Diaminoalkanes
作者:Liliana R. Orelli、Alejandra Salerno、Mónica E. Hedrera、Isabel A. Perillo
DOI:10.1080/00397919808006867
日期:1998.5
general procedure is described for regiospecific construction of unsymmetrical N-alkyl (or aralkyl)-N′-aryl-α,ω-diaminoalkanes 3 (n=2,3,4) by reduction of N-(ω -arylaminoalkyl)amides 2 with borane. Compounds 2 are readily obtained by condensation of N-(ω-haloalkyl)amides 1 with aromatic amines.
E/Z equilibrium in tertiary amides. Part 2: N-acyl-N′-arylhexahydropyrimidines
作者:Juan Á. Bisceglia、Ma. Cruz Mollo、Liliana R. Orelli
DOI:10.1016/j.molstruc.2009.12.011
日期:2010.3
presented. Due to hindered rotation around the (O)C–N bond, tertiary amides 1 exist as a mixture of non-separable E/Z diastereoisomers, which show separate signals in the NMR spectra. For some selected derivatives, differential assignment of the 1 H resonances of the E/Z rotamers was made on the basis of the magnitude of ASIS (anisotropic solvent induced shifts) effects and confirmed by NOESY. The
摘要 介绍了一系列新型 N-酰基-N ' - 芳基六氢嘧啶 1 的 1 H 和 13 C NMR 光谱研究。由于围绕 (O)C-N 键的旋转受阻,叔酰胺 1 以不可分离的 E/Z 非对映异构体的混合物形式存在,其在 NMR 光谱中显示出单独的信号。对于某些选定的衍生物,E/Z 旋转异构体的 1 H 共振的差异分配是根据 ASIS(各向异性溶剂引起的位移)效应的大小进行的,并由 NOESY 确认。HSQC 和 HMBC 实验明确地归因于相应的 13 C 信号。使用 ab initio RHF/6-311G++ 方法对两个代表性成员进行了详细的构象研究。
1,n-Diamines. Part 3: Microwave-assisted synthesis of N-acyl-N′-arylhexahydropyrimidines and hexahydro-1,3-diazepines
作者:Juan Á. Bisceglia、Jimena E. Díaz、Romina A. Torres、Liliana R. Orelli
DOI:10.1016/j.tetlet.2011.07.131
日期:2011.10
In this Letter we present a method for the synthesis of N-acyl-N'-arylhexahydropyrimidines 1, by ring closure of N-acyl-N'-aryl-1,3-propanediamines 3 with formaldehyde. Cyclodehydrations were performed in aqueous medium under microwave irradiation, and led to high yields of the desired compounds in remarkably short reaction times. The method also allowed for the synthesis of hitherto unreported N-acyl-N'-arylhexahydro-1,3-diazepines 2. The acyclic tetramethylenic precursors 4 were synthesized by selective functionalization of N-arylputrescines. (C) 2011 Elsevier Ltd. All rights reserved.
Microwave-enhanced synthesis of cyclic amidines
作者:Ma Beatriz García、Romina A. Torres、Liliana R. Orelli
DOI:10.1016/j.tetlet.2006.05.042
日期:2006.7
We present a simple and efficient microwave based protocol for the synthesis of heterocyclic amidines by PPE promoted cyclodehydration of N-aryl-N'-acylalkylenediamines. The method is general for five- to eight-membered heterocycles and affords high yields of the desired products in remarkably short reaction times. (c) 2006 Elsevier Ltd. All rights reserved.
Synthesis and properties of 1-aryl-2-alkyl-1,4,5,6-tetrahydropyrimidines
作者:Liliana R. Orelli、Fernando Niemevz、María B. García、Isabel A. Perillo
DOI:10.1002/jhet.5570360116
日期:1999.1
N-acyl-N′-aryltrimethylenediamines 2 with trimethylsilyl polyphosphate. Precursors 2 were obtained by aminolysis of the corresponding N-(3-bromopropyl)amides 3. The 1H nmr spectra of tetrahydropyrimidines 1 are analyzed, discussing the influence of substituents in positions 1 and 2 of the heterocyclic ring. Alkaline hydrolysis of compounds 1, which originates exclusively N-acyl-N′-aryltrimethylenediamines
描述了通过用多甲基三甲基甲硅烷基环化N-酰基-N'-芳基三亚甲基二胺2来合成1-芳基-2-烷基-1,4,5,6-四氢嘧啶1的通用方法。前体2通过相应的N-(3-溴丙基)酰胺3的氨解获得。分析了四氢嘧啶1的1 H nmr光谱,讨论了杂环1和2位上取代基的影响。化合物1的碱性水解,仅源于N-酰基-N'-芳基三亚甲基二胺2还通过中间体甲醇胺进行了研究。根据立体电子控制理论讨论了这种中间体的裂解。用硼烷还原化合物1会导致区域特异性地导致N-烷基-N'-芳基三亚甲基二胺6。