H-Bond-Assisted Intramolecular Nucleophilic Displacement of the 1-NMe<sub>2</sub> Group in 1,8-Bis(dimethylamino)naphthalenes as a Route to Multinuclear Heterocyclic Compounds and Strained Naphthalene Derivatives
作者:Maria A. Povalyakhina、Alexander S. Antonov、Olga V. Dyablo、Valery A. Ozeryanskii、Alexander F. Pozharskii
DOI:10.1021/jo201171z
日期:2011.9.2
It has been shown that azomethines, hydrazones, and oximes derived from 2(7)-carbonyl derivatives of 1,8-bis(dimethylamino)naphthalene can undergo acid-catalyzed heterocyclization leading to a nucleophilicdisplacement of the 1-NMe2 group. The process is believed to be directly connected with the proton sponge nature of the substrates, in which 1-NMe2, being a poor leaving group, is preliminary activated
已经表明,衍生自1,8-双(二甲基氨基)萘的2(7)-羰基衍生物的偶氮甲碱,和肟可以进行酸催化的杂环化作用,从而导致1-NMe 2基团的亲核取代。据信该方法与底物的质子海绵性质直接相关,其中作为不良离去基团的1-NMe 2通过形成螯合的质子化形式而被初步活化。已经以中等至高产率制备了许多难以接近的苯并[ g ]吲唑,苯并[ g ]喹唑啉,萘[2,1- d ]异恶唑和8-二甲基氨基-1-萘酚的衍生物。
Reaction of 2-trifluoroacetyl-1,8-Bis(dimethylamino)naphthalene with strong organic bases: Deprotonation of 1-NMe2 group resulting in the formation of Benzo[g]indole derivatives versus nucleophilic addition to C O group
作者:Alexander S. Antonov、Svetlana G. Kachalkina、Alexander F. Pozharskii、Gennady S. Borodkin、Aleksander Filarowski
DOI:10.1016/j.tet.2017.05.013
日期:2017.6
8-bis(dimethylamino)naphthalenes via treatment with 2-lithium-1,8-bis(dimethylamino)naphthalene producing the corresponding benzo[g]indole derivatives, was examined with different alkyl- and aryllithium compounds as well as with LDA. It was found that the highest yields of benzo[g]indoles (up to 70%) are obtained with aryllithium reagents when they contain NMe2 group in ortho-position to the carbanionic centre
通过用2-锂-1,8-双(二甲基氨基)萘处理产生相应的苯并[ g ]吲哚的新方法来封闭2-三氟乙酰基和2-乙氧基羰基-1,8-双(二甲基氨基)萘中的吡咯环用不同的烷基锂和芳基锂化合物以及LDA检查了它们的衍生物。发现当芳基锂试剂在碳负离子中心的邻位含有NMe 2基团时,使用芳基锂试剂可获得最高产率的苯并[ g ]吲哚(高达70%)。在所有其他情况下,由于碳通常通过分子间加成而形成无环醇。O组非常占优势。在2-锂-N,N-二甲基苯胺的情况下,通过反应过渡态的特定结构说明了底物中N-Me基团去质子化的显着促进,然后是吡咯环化。
1,8-Bis(dimethylamino)naphthyl-2-ketimines: Inside vs outside protonation
作者:A S Antonov、A F Pozharskii、P M Tolstoy、A Filarowski、O V Khoroshilova
DOI:10.3762/bjoc.14.273
日期:——
neutral imines can be stabilised by an intramolecular C=N-H···OMe hydrogen bond with a neighbouring methoxy group. Electron-donating OMe groups dramatically increase the basicity of the imino nitrogen, forcing the latter to abstract a proton from the protonsponge moiety in monoprotonated forms. The participation of the out-inverted and protonated 1-NMe2 group in the Me2N-H···NH=C hydrogen bond is experimentally
Out-Basicity of 1,8-bis(dimethylamino)naphthalene: the experimental and theoretical challenge
作者:Valery A. Ozeryanskii、Alexander F. Pozharskii、Alexander S. Antonov、Alexander Filarowski
DOI:10.1039/c3ob41986j
日期:——
group might chelate either the proton sponge 1-NMe2 group or another basic center (N,N-dimethylaniline) of known basicity; (2) measuring the basicity of naphtho[1,8-b,c]diazabicyclo[3.3.3]undecane considered to be a close analogue of the proton sponge capable exclusively of out-protonation; (3) X-ray, spectral and DFT studies of structure, energy and stereodynamics of compounds obtained, including their
Ring lithiation of 1,8-bis(dimethylamino)naphthalene: another side of the ‘proton sponge coin’
作者:Alexander S. Antonov、Alexander F. Pozharskii、Valery A. Ozeryanskii、Aleksander Filarowski、Kyrill Yu. Suponitsky、Peter M. Tolstoy、Mikhail A. Vovk
DOI:10.1039/c5dt02482j
日期:——
It has been found that 1,8-bis(dimethylamino)naphthalene (DMAN), unlike N,N-dimethylaniline, undergoes ring metallation in the n-BuLi–TMEDA–Et2O system with a low selectivity and in poor total yields. The situation is significantly improved in the t-BuLi–TMEDA–n-hexane system when 3- and 4-lithium derivatives become the only reaction products obtained in good yields. The formation of 3-Li-DMAN is especially