Results 121 to 130 of about 5,363,495 (332)

Synthesis of 10-Aza-9-oxakalkitoxin by NO Bond Formation

, 2022
We describe a formal synthesis of 10-aza-9-oxakalkitoxin, the hydroxalog of the cytotoxic marine natural product kalkitoxin, that features Mukaiyama Markovnikov silyl peroxidation of a terminal alkene and N–O bond formation as the central enabling ...
David Crich, Kapil Upadhyaya (1957873), David Crich (1314684), Kapil Upadhyaya   +3 more
core   +1 more source

Cytotoxic Triterpenoid Saponins from the Roots of Platycodon grandiflorum

Molecules, 2007
Bioguided fractionation of the ethanol extracts obtained from Platycodon grandiflorum roots led to isolation of two new triterpenoid saponins, characterized as 3-O-β-D-glucopyranosyl-2β,12α,16α,23,24-pentahydroxyoleanane-28(13)-lactone (1 ...
Jing-Kui Tian, Zhen-Huan Liu, Lin Zhang
doaj   +1 more source

Electrochemical Reduction of Aza-heteroaromatic Compounds Part I. Polarographic Reduction of Aza-heteroaromatic Compounds and Its Theoretical Consideration

Review of Polarography, 1971
Polarograms of methiodides of quinoline, isoquinoline, 3, 4- 5, 6- 7, 8-benzoquinoline, o-, m-, and p-phenanthroline were measured in aqueous solvents. Those obtained in aqueous solvents were complicated owing to adsorption of the reduced products on mercury surface, but those obtained in aprotic solvents were well-defined.
KATO, Shozo, NAKAYA, Jun'ichi, IMOTO, Eiji   +2 more
openaire   +2 more sources

Synthesis and Anti-tumor Activities of Novel [1,2,4]triazolo[1,5-a]pyrimidines

Molecules, 2007
A series of novel [1,2,4]triazolo[1,5-a]pyrimidine derivatives has been designed and synthesized in order to find novel anti-tumor compounds. The structures of all the compounds were confirmed by IR, 1H-NMR, MS and elemental analysis.
Ping Gong, Ding Wang, Hai-Sheng Song, Shu-Chun Guo, Yan-Fang Zhao, Xiang-Lin Zhao   +5 more
doaj   +1 more source

Synthesis and Structures of Mono(1-aza-allyl) Complexes of Aluminum^†

, 2016
The synthesis and structures of new aluminum complexes using the 1-aza-allyl ligand R (R = [N(SiMe3)C(Ph)C(SiMe3)2]-) are described. The reaction of RLi·THF with AlMe2Cl, AlMeCl2, AlCl3, and AlBr3 in diethyl ether or n-hexane, after workup, afforded ...
Hans-Georg Schmidt (2466637), Chunming Cui (1446892), Haijun Hao (2963763), Michael F. Lappert (1938727), Herbert W. Roesky (560521), Mathias Noltemeyer (2292994)   +5 more
core   +1 more source

Aza-bis(oxazolines):  New Chiral Ligands for Asymmetric Catalysis^†

, 2016
Aza-bis(oxazolines) are introduced as chiral ligands for asymmetric catalysis combining the advantages of easy availability of bis(oxazolines) and backbone variability of aza-semicorrins.
Oliver Reiser (1523011), Martin Glos (3062619)   +1 more
core   +1 more source

Synthesis and Thermolysis of Heterocyclic 3-Aza-3-ene-1,5-diynes¹

, 2016
Simple, acyclic 3-aza-3-ene-1,5-diynes undergo an aza-Bergman rearrangement to a fleeting 2,5-didehydropyridine (2,5-ddp) intermediate that rapidly ring-opens to β-alkynylacrylonitrile products.
Dalip Kumar (467427), Wendi M. David (2453752), Sean M. Kerwin (2180086), Asha K. Nadipuram (3066351)   +3 more
core   +2 more sources

Water, Alcohols, Amines, and Amides as Formal Hydrogen‐Atom‐Transfer Reagents Through Activation With Redox‐Active Lewis Acids

Angewandte Chemie, EarlyView.
Protic molecules containing strong O─H or N─H bonds typically resist hydrogen‐atom abstraction because of the high reactivity of the resulting heteroatom‐centered radicals. However, association of the protic molecules with redox‐active Lewis acids can provide powerful hydrogen‐atom donors or proton‐coupled‐electron‐transfer reagents.
Petra Vojáčková, Armido Studer
wiley   +1 more source

A New Convenient Synthesis of 5-Acyl-1,2,3,4-tetrahydropyrimidine-2-thiones/ones

Molecules, 1998
An efficient one-pot synthesis of 5-acyl-1,2,3,4-tetrahydropyrimidine-2-thiones/ones is described. The synthesis is based on the reaction of readily available α-tosyl substituted thioureas or ureas with enolates of β-oxoesters or 1,3-dicarbonyl ...
Aleksei Yu. Kuznetsov, Natalie V. Sivova, Ekaterina A. Kishko, Anatoly D. Shutalev   +3 more
doaj   +1 more source

Synthesis and Characterization of 1-Aza-allyl Complexes with Al−Al, Ga−Ga, and In−In Bonds^†

, 2016
The synthesis of new compounds containing Al−Al, Ga−Ga, and In−In bonds, the 1-aza-allyl ligand R (R = [(Me3Si)2C(Ph)C(Me3Si)N]), and halide substituents is described.
Hans-Georg Schmidt (2466637), Chunming Cui (1446892), Klaus S. Klimek (3076461), Herbert W. Roesky (560521), Mathias Noltemeyer (2292994)   +4 more
core   +1 more source