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。
Base-promoted transformation of 2-C(O)R-1,8-bis(dimethylamino)naphthalenes into benzo[g]indole derivatives
摘要:
1,8-Bis(dimethylamino)naphthalenes bearing 2-positioned trifluoroacetyl or ethoxycarbonyl group on treatment with 2-lithio-1,8-bis(dimethylamino)naphthalene undergo base-promoted transformation into benzo[g]indole derivatives in small to moderate yield, representing previously unknown mode of the pyrrole ring closure which proceeds via deprotonation of the NMe group.
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。
Base-promoted transformation of 2-C(O)R-1,8-bis(dimethylamino)naphthalenes into benzo[g]indole derivatives
作者:Svetlana G. Kachalkina、Gennady S. Borodkin、Alexander F. Pozharskii、Alexander S. Antonov、Inna G. Borodkina、Yuri F. Maltsev、Ekaterina A. Filatova、Aleksander Filarowski、Valery A. Ozeryanskii
DOI:10.1016/j.mencom.2015.05.007
日期:2015.5
1,8-Bis(dimethylamino)naphthalenes bearing 2-positioned trifluoroacetyl or ethoxycarbonyl group on treatment with 2-lithio-1,8-bis(dimethylamino)naphthalene undergo base-promoted transformation into benzo[g]indole derivatives in small to moderate yield, representing previously unknown mode of the pyrrole ring closure which proceeds via deprotonation of the NMe group.