38932-80-8Relevant articles and documents
Polybromide salts of tetraalkyl and N-heterocyclic cations: New entries into the structural library
Gorokh, Igor D.,Adonin, Sergey A.,Sokolov, Maxim N.,Abramov, Pavel A.,Korolkov, Ilya V.,Semitut, Evgeniy Yu.,Fedin, Vladimir P.
, p. 583 - 587 (2018)
Reactions between Br2 dissolved in HBr and salts of various organic cations resulted in formation of a series of polyhalide salts: (IsoquinolH)Br3 (1), (2-BrPyH)Br3 (2), (H2(4,4′-bipy))(Br3)2 (3), Bu4NBr3 (4), (Collidinium){(Br3)(Br2)} (5) and Et4N{(Br3)(Br2)2} (6). All compounds were characterized by X-ray diffractometry; the role of supramolecular Br?Br contacts is discussed.
A Photorobust Mo(0) Complex Mimicking [Os(2,2′-bipyridine)3]2+and Its Application in Red-to-Blue Upconversion
Bilger, Jakob B.,Kerzig, Christoph,Larsen, Christopher B.,Wenger, Oliver S.
supporting information, p. 1651 - 1663 (2021/02/01)
Osmium(II) polypyridines are a well-known class of complexes with luminescent metal-to-ligand charge-transfer (MLCT) excited states that are currently experiencing a revival due to their application potential in organic photoredox catalysis, triplet-triplet annihilation upconversion, and phototherapy. At the same time, there is increased interest in the development of photoactive complexes made from Earth-abundant rather than precious metals. Against this background, we present a homoleptic Mo(0) complex with a new diisocyanide ligand exhibiting different bite angles and a greater extent of π-conjugation than previously reported related chelates. This new design leads to deep red emission, which is unprecedented for homoleptic arylisocyanide complexes of group 6 metals. With a 3MLCT lifetime of 56 ns, an emission band maximum at 720 nm, and a photoluminescence quantum yield of 1.5% in deaerated toluene at room temperature, the photophysical properties are reminiscent of the prototypical [Os(2,2′-bipyridine)3]2+ complex. Under 635 nm irradiation with a cw-laser, the new Mo(0) complex sensitizes triplet-triplet annihilation upconversion of 9,10-diphenylanthracene (DPA), resulting in delayed blue fluorescence with an anti-Stokes shift of 0.93 eV. The photorobustness of the Mo(0) complex and the upconversion quantum yield are high enough to generate a flux of upconverted light that can serve as a sufficiently potent irradiation source for a blue-light-driven photoisomerization reaction. These findings are relevant in the greater contexts of designing new luminophores and photosensitizers for use in red-light-driven photocatalysis, photochemical upconversion, light-harvesting, and phototherapy.
Process Development of the HCV NS5B Site D Inhibitor MK-8876
Williams, Michael J.,Chen, Qinghao,Codan, Lorenzo,Dermenjian, Renee K.,Dreher, Spencer,Gibson, Andrew W.,He, Xianliang,Jin, Yan,Keen, Stephen P.,Lee, Alfred Y.,Lieberman, David R.,Lin, Wei,Liu, Guiquan,McLaughlin, Mark,Reibarkh, Mikhail,Scott, Jeremy P.,Strickfuss, Sophie,Tan, Lushi,Varsolona, Richard J.,Wen, Feng
, p. 1227 - 1238 (2016/07/23)
We describe the route development and multikilogram-scale synthesis of an HCV NS5B site D inhibitor, MK-8876. The key topics covered are (1) process improvement of the two main fragments; (2) optimization of the initially troublesome penultimate step, a key bis(boronic acid) (BBA)-based borylation; (3) process development of the final Suzuki-Miyaura coupling; and (4) control of the drug substance form. These efforts culminated in a 28 kg delivery of the desired active pharmaceutical ingredient.
