This paper evaluates the 5-aryl-2-pyridyloxazole backbone to engineer donor-acceptor fluorescentpHprobes after one- or two-photon absorption. Parent fluorophores, as well as derivatives that can be used to label biomolecules, can be easily obtained in good yields. These molecules exhibit a large one-photon absorption in the near-UV range, and a strong fluorescence emission that covers the whole visible
Iodine catalyzed synthesis of 2,5-substituted oxazoles from N-arylethylamides through intramolecular C(sp3)–H functionalization under metal-free conditions is described.
cis-(Dimethyl)(tri-p-tolylphosphine)(ligand)platinum(II) complexes (ligand substitutedpyridine or amine) have been prepared from PtMe2(1,5-COD) (COD cyclooctadiene), Ptol3 (tol tolyl) and the N-donor ligand. For ligand 4-(5-phenyl-2-oxazolyl)pyridine the crystal and molecular structure has been determined: space group R, a b 34.295(5), c 14.198(2) Å (− 100°C), γ 120°, V 14459 Å3, Z
顺式- (二甲基)(三- p -tolylphosphine)(配体)铂(II)络合物(配体取代的吡啶或胺)已经从PTME制备2(1,5-COD)(COD环辛二烯),PTOL 3( toltolyl)和N-供体配体。对于配体4-(5-苯基-2-恶唑基)吡啶的晶体和分子结构已被确定:空间群[R ,一个 b 34.295(5),Ç 14.198(2)A( - 100℃) ,γ120°,V 14459埃3,ž 18. 379个变量和4977层的反射与我>2σ(我)- [R 0.034,řw ^ 0.042。PtC键长是2.082(7)(落选至P)和2.059(8)(反式到N)。胺配体被乙烯置换,形成不稳定的乙烯加合物。
Iodine-Promoted Oxidative Cyclization of Methyl Azaarenes and α-Amino Ketones for One-Pot Synthesis of 2-Azaaryl-5-aryl Oxazoles
the synthesis of 2,5-disubstitutedoxazolesvia iodine-promoted oxidative domino cyclization. These reactions were performed with readily available methyl azaarenes and α-amino ketones under metal-free conditions. This protocol is a simple method with high functional group compatibility, a wide range of substrates, and excellent yield, providing a new way to synthesize azaarene-attached oxazoles.
An I-2-promoted sp(3) C-H functionalization has been developed for the synthesis of 2,5-disubstituted oxazoles from easily available methyl ketones and benzylamines without any metal and peroxide catalyst. This domino oxidative cyclization process involves the cleavage of C H bond and the formation of C-N, C-O bonds. (C) 2012 Elsevier Ltd. All rights reserved.