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。
Tandem Synthesis of 10-Dimethylaminobenzo[<i>h</i>]quinazolines from 2-Ketimino-1,8-bis(dimethylamino)naphthalenes via Nucleophilic Replacement of the Unactivated Aromatic NMe<sub>2</sub> Group
作者:Vladimir Y. Mikshiev、Alexander S. Antonov、Alexander F. Pozharskii
DOI:10.1021/acs.orglett.6b01178
日期:2016.6.17
a result of [2 + 2 + 2] nucleophilic cascade annulation produces 10-dimethylaminobenzo[h]quinazolines, as yet unknown NMe2/–N═ analogues of the proton sponge. It is even more convenient to use preliminarily prepared 2-ketimino-1,8-bis(dimethylamino)naphthalenes as starting material. The substitution of both peri-NMe2 groups furnishing quinazolino[7,8-h]quinazoline derivatives is also possible. The process
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
<i>peri</i>-Interactions in 1,8-bis(dimethylamino)naphthalene <i>ortho</i>-ketimine cations facilitate [1,5]-hydride shift: selective synthesis of 1,2,3,4-tetrahydrobenzo[<i>h</i>]quinazolines
作者:Vladimir Y. Mikshiev、Peter M. Tolstoy、Aleksandra M. Puzyk、Sergey O. Kirichenko、Alexander S. Antonov
DOI:10.1039/d2ob00674j
日期:——
Selective heterocyclization leading to 1,2,3,4-tetrahydrobenzo[h]quinazolines from ortho-ketimines of 1,8-bis(dimethylamino)naphthalene (DmanIms) under acid catalysis has been revealed. In contrast to the rather unreactive N,N-dimethylaniline ortho-ketimine, DmanIms readily undergo this transformation without an additional catalyst. This distinction in the reactivity underscores the importance of the
ortho-Ketimines of 1,8-Bis(dimethylamino)naphthalene: Synthesis, Hydrolytic Stability and Transfer of Basicity from Proton Sponge Moiety to the Imino Function
important of which is a strong electron-donor effect of peri-dimethylamino groups. A series of 2-ketimines and 2,7-diketimines of 1,8-bis(dimethylamino)naphthalene (proton sponge, DMAN) have been obtained and converted into the corresponding ketones via acidic hydrolysis. Investigation of structural and spectral properties of DMAN-based imines led to the conclusion that their unusual hydrolytic stability results
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。