Synthesis and detailed conformational analysis of new naphthoxazino[2,3-a]benz[c]azepine and naphthoxazino[2,3-a]thieno[3,2-c]pyridine derivatives
作者:István Szatmári、Petra Barta、Antal Csámpai、Ferenc Fülöp
DOI:10.1016/j.tet.2017.06.060
日期:2017.8
naphthoxazine by-products made the separation/purification of the products challenging, therefore the reactions were repeated and systematically studied, starting from secondary and tertiary aminonaphthol derivatives, when the isolation of an ortho-quinonemethide structure occurred unexpectedly. Scope and limitations of its formation were also investigated. Conformational studies including ring inversion of a
通过修饰的曼尼希型合成途径,通过4,5-二氢-3 H-苯并[ c ]氮杂或6,7-二氢噻吩并[3, 2- c ]吡啶和不同的取代氨基萘。使用微波辐射优化了反应条件,反应时间相对较短,温度为80°C。不需要的萘并恶嗪副产物的形成使产物的分离/纯化具有挑战性,因此,当分离邻位时,从仲氨基和叔氨基萘酚衍生物开始重复和系统地研究反应,从仲和叔氨基萘酚开始-醌甲基化物结构出乎意料地发生。还研究了其形成的范围和局限性。使用NMR方法和补充DFT建模进行了构象研究,包括对新型多杂环化合物的选择进行环倒置。
Unexpected isomerization of new naphth[1,3]oxazino[2,3-a]isoquinolines in solution, studied by dynamic NMR and supported by theoretical DFT computations
Through the reactions of 1-aminomethyl-2-naphthol and substituted 1-aminobenzyl-2-naphthols with 3,4-dihydroisoquinoline or 6,7-dimethoxy-3,4-dihydroisoquinoline under microwave conditions, naphth-[1,2-e][1,3]oxazino[2,3-a]-isoquinoline derivatives were prepared in good yields. The latter reaction was extended by using 2-aminoarylmethyl-1-naphthols, leading to isomeric naphth-[2,1-e][1,3]oxazino[2
在微波条件下,通过1-氨基甲基-2-萘酚和取代的1-氨基苄基-2-萘酚与3,4-二氢异喹啉或6,7-二甲氧基-3,4-二氢异喹啉的反应,萘基[[1,2- e]以高收率制备了[] [1,3]恶嗪[2,3- a ]-异喹啉衍生物。后者的反应通过使用2-氨基芳基甲基-1-萘酚来扩展,得到异构的萘基-[2,1- e ] [1,3]恶嗪基[2,3- a ]异喹啉。除了详细的NMR光谱学和理论研究以外,这些新的构象柔性杂环系统还具有立体化学和动力学行为,在溶液中观察到两个非对映异构体之间的意外动力学过程,并通过可变温度进行了研究11 H NMR光谱学和机理已通过理论DFT计算得到证明。
Transformation reactions of the betti base analog aminonaphthols
作者:István Szatmári、Anasztázia Hetényi、László Lázár、Ferenc Fülöp
DOI:10.1002/jhet.5570410310
日期:2004.5
number of centers of asymmetry were formed with nearly complete diastereoselectivity. Considerable differences were observed in the ring-closing abilities of the unsubstituted and phenyl-substituted aminonaphthols 1 and 2 and of the regioisomeric compounds 1 and 3.
通过1-(α-氨基苄基)-2-萘酚(贝蒂碱:1),1-氨基甲基-2-萘酚(2)和2-(α-氨基苄基)-1-的简单或多米诺环封闭反应萘酚(反向Betti碱:3)与光气,苯甲磺酸乙酯,2-羧基苯甲醛,乙酰丙酸,水杨醛/福尔马林或水杨醛/乙醛,萘[1,2- e ] [1,3]恶嗪和萘[2,1-制备了e ] [1,3]恶嗪衍生物。1和3的所有氮桥多环衍生物包含许多不对称中心的化合物几乎具有完全非对映选择性。在未取代的和苯基取代的氨基萘1和2以及区域异构化合物1和3的闭环能力上观察到相当大的差异。
Microwave-Assisted One-Pot Synthesis
of (Aminoalkyl)naphthols and (Aminoalkyl)quinolinols by
Using Ammonium Carbamate or Ammonium Hydrogen Carbonate
as Solid Ammonia Source
作者:Ferenc Fülöp、István Szatmári
DOI:10.1055/s-0028-1083347
日期:——
Ammonium carbamate and ammonium hydrogen carbonate were used as very effective solid ammonia sources to prepare different (aminoalkyl)naphthols and (aminoalkyl)quinolinols in ethanol and water as solvents under microwave conditions in modified three-component Mannich reactions. The products were obtained in excellent yields in one-pot reactions.