Results 21 to 30 of about 2,944,243 (309)

Novel functional [4]helicenes through a photooxidation pathway. Investigation of the absorption and fluorescence in solution

Comptes Rendus. Chimie, 2021
Novel functional [4]helicenes have been designed and synthesized, in 54%–72% overall yields, through an operational and simple two-step photochemical approach starting from various p-substituted phenylacetonitriles, and were characterized by NMR ($^{1}$H,
Hafedh, Nesrine, Asghar, Basim H., Aloui, Faouzi   +2 more
doaj   +1 more source

Asymmetric synthesis of (−)-naltrexone

Chemical Science, 2019
The asymmetric synthesis of (−)-naltrexone was achieved by a Rh( i )-catalyzed C–H alkenylation and torquoselective electrocyclization cascade and late-stage C–H hydroxylation.
Sun Dongbang, Blaine Pedersen, Jonathan A. Ellman   +2 more
openaire   +3 more sources

Asymmetric synthesis via iron acyl complexes [PDF]

, 1986
This thesis describes the applications to asymmetric synthesis of the highly diastereoselective carbon-carbon bond forming reactions of α,β-unsaturated acyl ligands bound to the chiral iron auxiliary [(η5-C5H5)Fe(CO)(PPh3)]. Chapter 1 briefly reviews the
Walker, Jonathan, Walker, J. C.
core   +1 more source

Collective Asymmetric Total Synthesis of Cylindricines [PDF]

, 2023
Collective asymmetric total synthesis of marine tricyclic alkaloids, cylindricines A–H, and the proposed structures of cylindricine I and J, was achieved in a concise manner from a single common spirocyclic pyrrolidine intermediate.
Haruhiko, Fuwa, Ryohei, Hanzawa
core   +2 more sources

7-Cyano-15-methoxy[6]helicene through a photochemical pathway and investigation of its chiroptical and photophysical properties

Comptes Rendus. Chimie, 2021
7-Cyano-15-methoxy[6]helicene was synthesized, in 54% overall yield, through a short photochemical procedure including mild conditions and inexpensive reagents.
Hafedh, Nesrine, Asghar, Basim H., Aloui, Faouzi   +2 more
doaj   +1 more source

Untethering sparteine: 1,3-diamine ligand for asymmetric synthesis in water [PDF]

, 2021
Chiral ligands are the toolbox for asymmetric synthesis to access 3D molecular world. Enabling efficient asymmetric reaction in water is a big challenge. As moisture/air stable and strong binding moieties, amines, compared to imine and phosphine ligands,
Chen, Chen, Shihao, Huang, Yuting, Yan, Liu, Liu, Guotao, Lin, Yanfeng, Dang, Jianhui, Huang, Fanyun , Zeng, Yuan, Zhang, Mingyu, Zhang, Yifan, Li, Bo, Li   +11 more
core   +2 more sources

A one-pot, enantioselective allylic oxidation of cycloolefins: a novel benzoic acid/TBHP system catalyzed by Cu-complexed SBA-15-immobilized chiral aniline oxazoline ligands [PDF]

RSC Advances
An innovative one-pot approach for efficient enantioselective allylic oxidation of cycloolefins has been developed using benzoic acid derivatives/tert-butyl hydroperoxide to synthesize enantioenriched allylic esters in good to high yields (up to 87%) and
Shiva Majidian, Hamid Arvinnezhad, Saadi Samadi   +2 more
doaj   +1 more source

Synthesis and investigation on optical and electrochemical properties of 2,4-diaryl-9-chloro-5,6,7,8-tetrahydroacridines

Beilstein Journal of Organic Chemistry, 2021
A facile synthesis of 2,4-diaryl-9-chloro-5,6,7,8-tetrahydroacridine derivatives is reported which is based on POCl3-mediated cyclodehydration followed by double Suzuki–Miyaura cross-coupling.
Najeh Tka, Mohamed Adnene Hadj Ayed, Mourad Ben Braiek, Mahjoub Jabli, Peter Langer   +4 more
doaj   +1 more source

2,4-Bis(arylethynyl)-9-chloro-5,6,7,8-tetrahydroacridines: synthesis and photophysical properties

Beilstein Journal of Organic Chemistry, 2021
Acridine derivatives have attracted considerable interest in numerous areas owing to their attractive physical and chemical properties. Herein, starting from readily available anthranilic acid, an efficient synthesis of 2,4-bis(arylethynyl)-9-chloro-5,6 ...
Najeh Tka, Mohamed Adnene Hadj Ayed, Mourad Ben Braiek, Mahjoub Jabli, Noureddine Chaaben, Kamel Alimi, Stefan Jopp, Peter Langer   +7 more
doaj   +1 more source

Asymmetric methodologies for the construction of 5,7,5- and 6,6,6-tricyclic sesquiterpene lactones towards the synthesis of Arglabin [PDF]

, 2007
Many naturally extracted guaianolides (i.e. GLs) and pseudoguaianolides are based on the 5,7,5-fused ring skeleton and they show a broad biological profile. Among them, Arglabin has attracted special attention due to its promising antitumor and cytotoxic
Jeong, Won Boo
core   +1 more source