Efficient route to benzo[4,5]imidazo[2,1-a]phthalazines
作者:Viktor A. Kuznetsov、Kirill M. Shubin、Andrej A. Schipalkin、Mikhail L. Petrov
DOI:10.1016/j.tet.2006.07.089
日期:2006.10
Benzo[4,5]imidazo[2,1-a]phthalazines have been obtained from various o-nitrophenylhydrazines through different 2-(2-nitrophenyl)-1,2-dihydro-1-phthalazinones as intermediates using an elaborated advanced procedure. An activated chlorine atom in 2-nitrophenyl moiety of the latter is able to undergo nucleophilic substitution for secondary alicyclic amines yielding novel substituted phthalazinones. Their
苯并[4,5]咪唑基[ 2,1- a ]酞嗪已通过精心设计的先进方法,通过不同的2-(2-硝基苯基)-1,2-二氢-1-酞嗪酮作为中间体,从各种邻硝基苯肼中获得。后者的2-硝基苯基部分中的活化氯原子能够被亲脂取代成脂环族仲胺,从而产生新的取代的邻苯二氮酮。它们的一锅还原和环脱水反应生成了一系列新型取代的苯并[4,5]咪唑并[2,1- a ]邻苯二嗪。
Selective non-nucleoside HIV-1 reverse transcriptase inhibitors. New 2,3-dihydrothiazolo[2,3-a]isoindol-5(9bH)-ones and related compounds with anti-HIV-1 activity
A series of substituted 2,3-dihydrothiazolo[2,3-a]isoindol-5(9bH)-ones and related compounds 1-73 were synthesized and evaluated for their ability to inhibit reverse transcriptase (RT) of the human immune deficiency virus 1 (HIV-1) and replication of HIV-1 in MT2 cells. The antiviral activity of these compounds depends on the stereoselective configuration of the substituent in position 9b. Structure-activity
Ni(0)-Catalyzed Dimerization of o-Keto Carboxylic Acid Pseudochlorides
作者:T. A. Yangirov、A. A. Fatykhov、E. A. Sedova、N. G. Gileva、R. R. Khafizova、E. S. Meshcheryakova、L. M. Khalilov、V. A. Kraikin
DOI:10.1134/s1070428019050142
日期:2019.5
3′-diaryl-3,3′-diphthalides by dehalogenation of o-keto carboxylicacid pseudochlorides is implemented. The feature of the new protocol is that the reaction is carried out in the presence of a zero-valent nickel complex catalyst generated in situ by mixing zinc powder, nickel(II) chloride, triphenylphosphine, and 2,2′-bipyridine. Along with the target dimerization products of pseudochlorides, minor products were
Perfluoroalkanesulfonic Acid Catalyzed Acylations of Alkylbenzenes: Synthesis of Alkylanthraquinones
作者:Franz Effenberger、Frank Buckel、Andreas H. Maier、Judith Schmider
DOI:10.1055/s-2000-7102
日期:——
dealkylation. The yield of benzoylation of p-xylene 4 with benzoic acid in the presence of 5 mol% C4F9SO3H to give 2,5-dimethylbenzophenone 5 could significantly be improved from 14% to 90% by continuous removal of water formed during the acylation. Also in the preparation of alkylanthraquinones 7 by reaction of alkylbenzenes with phthalic anhydride, water removal is the decisive factor to obtain satisfactory
2-aroylbenzoic acids 1a–d is described (Scheme 1). Of the colourless dimers 3a–d, only the sterically congested 3a and 3b dissociate at ambient temperature in solution to the deep red free 3-oxoisobenzofuran-1-yl radicals 4a and 4b, respectively. The radicals 4a, b are extremely persistent in the absence of O2. The structures of these radicals are confirmed and the coupling constants assigned by ESR and ENDOR