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。
1,8,1′,8′-Tetrakis(dimethylamino)-2,2′-dinaphthylmethanols: Double <i>In/Out</i> Proton Sponges with Low-Barrier Hydrogen-Bond Switching
作者:Alexander F. Pozharskii、Alexander V. Degtyarev、Valery A. Ozeryanskii、Oksana V. Ryabtsova、Zoya A. Starikova、Gennadii S. Borodkin
DOI:10.1021/jo100384s
日期:2010.7.16
Previously unknown bis[1,8-bis(dimethylamino)naphth-2-yl]phenylmethanol (5) and bis[1,8-bis(dimethylamino)naphth-2-yl]methanol (6) have been obtained and studied by combination of X-ray, NMR, and IR techniques at variable temperature. It has been established that both proton sponge units in the solid tertiary alcohol 5 exist in nonconventional in/out form, one of which is fixed by intramolecular O-H center dot center dot center dot N hydrogen bonding. In solution, a fast interconversion of two isoenergetic hydrogen chelates occurs which can be frozen below 183 K. Unlike this, the secondary alcohol 6 in the solid at 100 K adopts the in/out-in/in conformation and at 293 K demonstrates a kind of dynamic behavior which can be described as temperature-driven dimer-induced rechelation. In solution under ambient conditions 6 exists as an equilibrating mixture of chelated and unchelated monomeric forms in a similar to 1:1.8 molar ratio.
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。