Synthesis, Structure, and Biological Evaluation of Novel N- and O-Linked Diinositols
摘要:
Several O-and N-linked inositols and/or aminoinositols have been prepared by iterative opening of epoxides and aziridines derived from homochiral cyclohexadiene cis-diols. The three inositols and their intermediate conduritols (conduramines) were tested against several glycosiclases (alpha- and beta-glucosidase, alpha- and beta-galactosidase, alpha- and beta-mannosidase) in an assay that measured the rate of hydrolysis of p-nitrophenolglycosides rather than the concentration of p-nitrophenolate. Somewhat surprisingly, the best inhibition was seen against beta-galactosidase with several of the compounds. The inositols linked through oxygen or nitrogen were subjected to calcium binding studies performed in NMR experiments. Detailed analysis of the title compounds by NMR spectroscopy has been performed, and full assignments were made. One of the attendant benefits of the preparation of these compounds has been expressed in the design and synthesis of new salen catalysts whose effectiveness has been compared with Jacobsen's catalyst in the epoxidation of styrene.
The imination of allylic phenyl tellurides with [N-(ptoluenesulfonyl)imino]phenyliodinane or chloramine-T affords the corresponding allylic amines via [2,3]sigmatropicrearrangement of the tellurimide intermediates in high yields. Application to chiral cinnamyl 2-(1-dimethylaminoethyl)ferrocenyl telluride results in the formation of the corresponding chiral allylic amine, 3-phenyl-3-tosylaminopropene
Facile alkane functionalization in copper-[2.1.1]-(2,6)-pyridinophane-PhINTs systemsElectronic supplementary information (ESI) available: experimental details. See http://www.rsc.org/suppdata/cc/b3/b309519c/
作者:Andrei N. Vedernikov、Kenneth G. Caulton
DOI:10.1039/b309519c
日期:——
Mild catalytic dehydrogenation of cycloalkanes (cyclo-C(5)H(10), cyclo-C(6)H(12), cyclo-C(8)H(16)) and aziridination of resulting olefins is reported with PhINTs and copper-[2.1.1]-(2,6)-pyridinophane (L) complexes LCuX(n)(n= 1, 2; X = Cl, OTf)"activated" with NaBAr(F)(4) in dichloromethane solution.
据报道,PhINTs和铜对环烷烃(cyclo-C(5)H(10),cyclo-C(6)H(12),cyclo-C(8)H(16))进行轻度催化脱氢和所得烯烃的叠氮化-[2.1.1]-(2,6)-吡啶并((L)与NaCur(F)(4)在二氯甲烷溶液中“活化”的LCuX(n)(n = 1,2; X = Cl,OTf)络合物。
BISPIDON LIGANDS AND THE METAL COMPLEXES THEREOF
申请人:Comba Peter
公开号:US20110003984A1
公开(公告)日:2011-01-06
The present invention relates to novel bispidon ligands, a method for the production thereof, and the use thereof as a ligand in metal complexes and the selective separation of metals, metal complexes comprising said ligands, method for the production thereof, and the use of such metal complexes in organic synthesis, in bleaching, and in the radiopharmaceutical field.
Iron-catalyzed efficient intermolecular amination of C(sp<sup>3</sup>)–H bonds with bromamine-T as nitrene source
作者:Haiyu Wang、Yuxi Li、Zhiming Wang、Jun Lou、Yuling Xiao、Guofu Qiu、Xianming Hu、Hans-Josef Altenbach、Peng Liu
DOI:10.1039/c4ra02240h
日期:——
[Fe(N4Py)(CH3CN)](ClO4)2 can efficiently catalyze intermolecular nitrene insertion of sp3 C–H bonds with bromamine-T as the nitrene source, forming the desired tosylprotected amines with NaBr as the by-product.
Enantioselective Synthesis of Allenamides via Sulfimide [2,3]-Sigmatropic Rearrangement
作者:Alan Armstrong、Daniel P. G. Emmerson
DOI:10.1021/ol900146s
日期:2009.4.2
Chiral allenamides are prepared with high levels of enantiomeric purity by [2,3]-sigmatropic rearrangement of propargylic sulfimides. The required branched propargylic sulfides are prepared by an enantioselectiveorganocatalytic aldehyde α-sulfenylation followed by Corey−Fuchs alkynylation.