63122-43-0Relevant academic research and scientific papers
Expedient one-pot synthesis of pyrroles from ketones, hydroxylamine, and 1,2-dichloroethane
Trofimov, Boris A.,Mikhaleva, Al'Bina I.,Ivanov, Andrei V.,Shcherbakova, Viktoria S.,Ushakov, Igor A.
, p. 124 - 128 (2015/02/02)
2- and 2,3-Substituted pyrroles are readily synthesized in a one-pot procedure from ketones, hydroxylamine hydrochloride, and 1,2-dichloroethane in the KOH/DMSO system (120 °C, 2-4 h), the yields of pyrroles ranging 11-85%. Aliphatic, cycloaliphatic, aromatic, and heteroaromatic ketones tolerate the reaction conditions.
Synthesis and optical properties of 2-(Benzo[b]thiophene-3-yl)pyrroles and a new bodipy fluorophore (BODIPY = 4,4-Difluoro-4-bora-3a,4a-diaza-s-indacene)
Schmidt, Elena Yu.,Trofimov, Boris A.,Mikhaleva, Al'bina I.,Zorina, Nadezhda V.,Protzuk, Nadezhda I.,Petrushenko, Konstantin B.,Ushakov, Igor A.,Dvorko, Marina Yu.,Meallet-Renault, Rachel,Clavier, Gilles,Vu, Thanh Truc,Tran, Ha Thanh Thao,Pansu, Robert B.
body text, p. 5823 - 5830 (2010/01/19)
2-(Benzo[b]thiophene-3-yl)-1-vinylpyrrole has been synthesized directly from 3-acetylbenzo[b]thiophene oxime and acetylene (flow system, KOH-DMSO, 120 °C, 5 h) in 68% yield. Devinylation of the synthesized pyrrole (Hg(OAc)CU2, NaBH4, 50 °C) led to the corresponding 2-(benzo[b]thio-phene-3-yl)pyrrole in 63% yield. Tri-fluoroacetylation of both the pyrroles with trifluoroacetic anhydride (80 °C, 1 h) gave the corresponding 5-trifluor-oacetyl pyrroles in 97% and 76% yields, respectively. 2-(Benzo[b]thio-phene-3-yl)pyrrole was reacted subsequently with mesityl aldehyde, 2,3-di-chloro-5,6-dicyano-1,4-benzoquinone (DDQ), and BF 3·OEt2 to afford 4,4-di-fluoro-3,5- diT(benzo[CAGHRUENb]thiophene-3-yl)-8-mesityl-4-bora-3a,4a-diaza-s-inda-cene, a representative of the novel BODIPY fluorophore family (BODIPY = 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene), in 34% overall yield. The synthesized pyrroles exhibit promising optical properties (absorption and emission spectra, nonlinear optical (NLO) features), superior to existing analogues. The BODIPY fluorophore displays an intense red-shifted fluorescence emission in CH2Cl2(625 nm, 0.84 fluorescence quantum yield) that is fully preserved in the solid state.
The triphenyl phosphite-chlorine reagent in the synthesis of pyrroles from N-allylamides
Spaggiari, Alberto,Vaccari, Daniele,Davoli, Paolo,Prati, Fabio
, p. 995 - 998 (2007/10/03)
A novel application of (PhO)3P-Cl2 chemistry to the synthesis of 2-substituted and 2,3-disubstituted pyrroles from N-allyl-amides is illustrated. A mild procedure is used to generate the imino chloride intermediates, which are subseq
Gold(I)-catalyzed intramolecular acetylenic Schmidt reaction
Gorin, David J.,Davis, Nicole R.,Toste, F. Dean
, p. 11260 - 11261 (2007/10/03)
Substituted pyrroles were prepared by a gold(I)-catalyzed acetylenic Schmidt reaction of homopropargyl azides. The reaction allows for regiospecific substitution at each position of the pyrrole ring under mild conditions. A mechanism in which azides serve as nucleophiles toward gold(I)-activated alkynes with subsequent gold(I)-aided expulsion of dinitrogen is proposed. Copyright
A second generation synthesis of roseophilin and chromophore analogues
Furstner,Gastner,Weintritt
, p. 2361 - 2366 (2007/10/03)
A concise, flexible, and high-yielding synthesis of the macrocyclic compound 4 is outlined which served as a key intermediate in a previous total synthesis of the antitumor active alkaloid roseophilin 1. The key steps of this approach consist of a Pd(0)-catalyzed reaction of vinyloxirane 6 with sulfone 7 and in a subsequent ring closing metathesis (RCM) reaction for the formation of the 13-membered ring catalyzed by the ruthenium carbene Cl2(PCy3)2Ru=CHCH=CPh2 introduced by Grubbs. Moreover, nitrile ylide cycloaddition reactions are used for the preparation of roseophilin side chain mimics. Finally, the synthesis of various chromophore analogues of 1 is reported, including deschlorodesmethoxyroseophilin 12 which is the most elaborate derivative of this complex target reported so far.
N-Vinyl Pyrroles as Protected Pyrroles
Trofimov,Korostova,Shevchenko,Mikhaleva,Matel'
, p. 865 - 867 (2007/10/03)
N-Vinyl-2-phenyl-, N-vinyl-3-isopropyl-2-(4-methoxyphenyl)-, N-vinyl-3-isopropyl-2-(4-chlorophenyl)-, N-vinyl-2-furyl-, N-vinyl-2-(5-methyl-2-furyl)pyrroles were converted into N-unsubstituted pyrroles in 67-99% yield by mercuration with mercury(II) acetate with subsequent reduction of the intermediate with sodium borohydride. An exception was N-vinyl-3-isopropyl-2-(4-chlorophenyl)pyrrole which gave the corresponding N-unsubstituted pyrrole in as low as 38% yield.
NUCLEOPHILIC ADDITION TO ALKYNES IN SUPERBASIC CATALYTIC SYSTEMS. V. VINYLATION OF KETOXIMES
Tarasova, O. A.,Korostova, S. E.,Mikhaleva, A. I.,Sobenina, L. N.,Nesterenko, R. N.,et al.
, p. 863 - 869 (2007/10/02)
The nucleophilic addition of the oximes of aliphatic, aromatic, and heteroaromatic ketones to acetylene in the superbasic heterophase potassium hydroxide-DMSO system was studied.The vinylation of ketoximes not containing a CH2 group at the α position to the oxime function goes well, and the yields of the O-vinyloximes are 38-72percent.With such a group and with electronegative substituents in the aromatic ring of the ketoxime rapid heterocyclization of the O-vinyloximes occurs under the reaction conditions, giving the corresponding 2-substituted pyrroles.
CONVENIENT METHOD OF PREPARING 3-SUBSTITUTED 2,2'-FURYL(THIENYL)PYRROLES
Nadim, Al' Mokhana,Romashin, Yu. N.,Kulinkovich, O. G.
, p. 918 - 920 (2007/10/02)
2,2'-Furyl(thienyl)pyrroles and their 3-decylthio derivatives were synthesized by the Paal-Knorr reaction from the corresponding 3-unsubstituted or 3-decylthio-substituted dimethylacetals of 4-(2-furyl)- and 4-(2-thienyl)-4-oxobutanal.The starting materia
PYRROLES ROM KETOXIMES AND ACETYLENE. 40. REACTION OF ALKYL HETARYL KETOXIMES WITH 1,2-DICHLOROETHANE IN SUPERBASE MEDIA
Korostova, S. E.,Nesterenko, R. N.,Mikhaleva, A. I.,Polovnikova, R. I.,Golovanova, N. I.
, p. 749 - 754 (2007/10/02)
2-(2-Furyl)- and 2-(2-thienyl)pyrroles and their N-vinyl derivatives were synthesized by the reaction of alkyl furyl (thienyl) ketoximes with 1,2-dichloroethane in superbase media. 2-Chloroethyl and vinyl ethers of alkyl hetaryl ketoximes are intermediates in the reaction.
Silylamines in organic synthesis: preparation and some reactions of N,C-dilithiosilylamines
Burns, Stephanie A.,Corriu, Robert J. P.,Huynh, Vilam,Moreau, Joel J. E.
, p. 281 - 290 (2007/10/02)
The dimetallation of some olefinic and aromatic N-trimethylsilylamines has been examined.Treatment with a two molar proportion of n-butyllithium gives organodimetallic reagents, which react with trimethylchlorosilane to give N,N,C-tris(trimethylsilyl)amines in 45 to 65percent yields.The dianonic reagent obtained from (trimethylsilyl)(allyl)amine reacts with benzoyl chloride, N,N-dimethylformamide, ethyl-2-furylcarboxylate, and benzil to give substituted pyrroles and pyridines.
