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Copper(II)/Palladium(II) catalysed highly selective cross-coupling of terminal alkynes in supercritical carbon dioxide
10.1016/j.tet.2018.02.060 2018-02-25 An efficient protocol for the synthesis of unsymmetrical 1,3-diynes was developed using supercritical carbon dioxide (ScCO2) as the solvent. The direct coupling of two different terminal alkynes is catalysed by a bimetallic catalyst, CuCl2·2H2O/Pd(NH3)4Cl2·H2... |
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Synthetic studies on a series of functionalized pyrylium salts, 4-chloro- and 4-bromophosphinines
10.1016/j.tet.2018.02.053 2018-02-25 A series of new pyrylium salts that bear sulfonate and phosphonate groups were obtained from the reactions between 2,6-diphenyl-4H-pyran-4-one, sulfonic anhydride, and chlorophosphates, and analyzed spectroscopically. Furthermore, treatment of 2,6-diphenyl-4H... |
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Recyclable alkylated Ru(bpy)32+ complex as a visible-light photoredox catalyst for perfluoroalkylation
10.1016/j.tet.2018.01.040 2018-02-25 A recyclable Ruthenium tris [4,4′-bis (dinonylmethyl)-2,2′-bipyridine] (Ru[(DNM)2bpy]32+) photocatalyst (PC) was synthesized. Hexane-phase-selective solubility allowed its simple and efficient separation from reaction products via solvent extraction. The exce... |
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Copper(II) catalyzed heterobenzylic C(sp3)-H activation: Two efficient halogenation methodologies towards heterobenzyl halides
10.1016/j.tet.2018.02.058 2018-02-24 Two practical and simple synthetic methodologies towards various heterobenzyl halides were developed. A series of 2-halomethylquinolines were readily prepared by the one-pot reaction of 2-methylquinolines with CuX (X = I, Br, Cl) and TBHP in CH3CN. A large va... |
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Three-component one-pot synthesis of N-arylsulfonyl-2-iminocoumarins
10.1016/j.tet.2018.02.052 2018-02-24 A one-pot, synthesis of N-arylsulfonyl-2-iminocoumarins is developed at ambient temperature by the reaction of 2-hydroxybenzaldehydes, arylacetonitriles, and aryl sulfonyl chlorides using DABCO as a base in a bio-mass-derived green solvent 2-MethylTHF. A simp... |
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Air-stable μ2-hydroxyl bridged cationic binuclear complexes of zirconocene perfluorooctanesulfonates: their structures, characterization and application
10.1016/j.tet.2018.02.057 2018-02-24 Three air-stable zirconocene perfluoro-octanesulfonates were successfully synthesized by treatment of C8F17SO3Ag with (RCp)2ZrCl2 [R = H, n-Bu, t-Bu]. According to X-ray analysis, they have μ2-hydroxyl bridged cationic binuclear structures: (i) [CpZr(OH2)3]2(... |
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Synthesis of 3-fluoro-3-methyl-3-silatetrahydropyran and its conformational preferences in gas and solution by GED, NMR and theoretical calculations
10.1016/j.tet.2018.02.055 2018-02-24 The 3,3-disubstitued 3-silaheterocyclohexane with an electronegative substituent at silicon, 3-fluoro-3-methyl-3-silatetrahydropyran 1, was synthesized, and its molecular structure and conformational properties studied by gas-phase electron diffraction (GED) ... |
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Inclusion complexation of a deep cavitand with imidazoquinoxaline flaps forming stable vase-like conformation
10.1016/j.tet.2018.01.049 2018-02-24 The stability of the vase-like conformation of a deep cavitand 1 with four imidazoquinoxaline flaps was studied in CDCl3/CD3OD by 1H NMR method. The annular tautomerism of cavitand 1·4MeOD in CDCl3/CD3OD (1:9 v/v) was investigated by 1H NMR and the free energ... |
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A practical method for heterogeneously-catalyzed Mizoroki–Heck reaction: Flow system with adjustment of microwave resonance as an energy source
10.1016/j.tet.2018.02.044 2018-02-23 The microwave-assisted and continuous-flow Mizoroki–Heck reaction using a heterogeneous palladium catalyst supported on the anion-exchange resin DIAION WA30 (7% Pd/WA30) is described. The microwave resonance is finely adjusted to 2.4 GHz according to the elec... |
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Direct Aminophosphonylation of aldehydes catalyzed by cyclopentadienyl ruthenium(II) complexes
10.1016/j.tet.2018.02.047 2018-02-23 This work reports a novel method for the direct aminophosphonylation of aldehydes catalyzed by cyclopentadienyl ruthenium(II) complexes. The system HP(O)(OEt)2/[CpRu(PPh3)2Cl] was very efficient for the aminophosphonylation of aldehydes with primary and secon... |