macrocycle showed a liquid‐crystalline phase with a lamellar structure and poor birefringence. In sharp contrast, the macrocyclic Ni complex showed a columnar oblique liquid‐crystalline phase, whereas the Pd and Cucomplexes showed columnar liquid‐crystalline phases with a lamellar structure. The macroscopic organization and thermal properties of the corresponding liquid‐crystalline metallomacrocycles
Efficient synthesis of (2R,3R)- and (2S,3S)-2,3-diaminobutane-1,4-diol and their dibenzyl ethers
作者:Andreas Scheurer、Paul Mosset、Rolf W Saalfrank
DOI:10.1016/s0957-4166(97)00086-4
日期:1997.4
(2R,3R)-2,3-Diaminobutane-1,4-diol 6 and its dibenzyl ether 7 were efficiently synthesized starting from L-tartaric acid 1a. The crucial step, debenzylation of intermediate dibenzyloxydiazide 4, was accomplished in good yield by boron trichloride-dimethyl sulfide complex. The enantiomeric series was similarly obtained starting from D-tartaric acid.
The design of protozoan phosphoribosyltransferase inhibitors containing non-charged phosphate mimic residues
作者:Sinan Gai、Kajitha Suthagar、Karl J. Shaffer、Wanting Jiao、Yacoba V.T. Minnow、Kayla Glockzin、Sean W. Maatouk、Ardala Katzfuss、Thomas D. Meek、Vern L. Schramm、Peter C. Tyler
DOI:10.1016/j.bmc.2022.117038
日期:2022.11
Protozoan parasites such as Plasmodium and Trypanosoma spp. are unable to synthesise purines de novo and rely on the salvage of purines from the host cell to synthesise free purine bases. Purine phosphoribosyltransfereases (PPRTases) play a crucial role for purine salvage and are potential target for drug development. Here we present attempts to design inhibitors of PPRTases that are non-ionic and show affinity
Desymmetrisation of C2-symmetric (2S,3S)-diazidobutane-1,4-diol with benzaldehyde
作者:Andreas Scheurer、Walter Bauer、Frank Hampel、Christine Schmidt、Rolf W. Saalfrank、Paul Mosset、Ralph Puchta、Nico J.R. van Eikema Hommes
DOI:10.1016/j.tetasy.2004.01.027
日期:2004.3
Surprisingly, doubly functionalised (2S,3S)-diazidobutane-1,4-diol under modified Boyer conditions reacted with only 1 equiv of benzaldehyde yielding a mono oxazoline, whereas quantum chemical studies favour the formation of the C-2-symmetric bioxazoline. In addition, the oxazoline formation was indirectly confirmed via detailed NMR studies and X-ray structure analysis of the oxazoline p-nitrobenzoic acid ester derivative. (C) 2004 Elsevier Ltd. All rights reserved.
Palladium(II) and platinum(II) complexes containing dimesyloxy-substituted chiral diamines
作者:Chin-Chin Lim、K.F. Mok、K.Y. Sim、Pak-Hing Leung
DOI:10.1016/s0957-4166(97)00179-1
日期:1997.6
The physically stable but chemically reactive square-planar complex (+)-[(dichloro)((S,S)-1,4-dimesyloxy-2,3-butanediamine)palladium(II)] and its platinum(II) analogue have been prepared from the reactions between the dihydrochloride salt of the diamine and K2MCl4 (where M = Pd, Pt) in water. The palladium complex has been analysed by X-ray crystallography. In contrast to their metal complexes, the free diamine ligand and its dihydrochloride salt are unstable and cannot be isolated. (C) 1997 Elsevier Science Ltd.