following an 11-step reaction sequence. The tetrahydrofuran amino acid is used as a buildingblock for a new peptide nucleicacid (PNA), which exhibits excellent DNA binding affinity with high specificity. It also shows preference for binding to DNA over RNA and specifically in the antiparallel orientation. In addition, the presence of the hydrophilic tetrahydrofuran ring in the PNA structure reduces nonspecific
A greener enantioselective synthesis of the antiviral agent North-methanocarbathymidine (N-MCT) from 2-deoxy-d-ribose
作者:Olaf R. Ludek、Victor E. Marquez
DOI:10.1016/j.tet.2009.08.035
日期:2009.10
An enantioselective synthesis of suitably protected (1R,2S,4S,5S)-4-amino-1-(hydroxymethyl)bicyclo[3.1.0]hexan-2-ol, a key starting material for the synthesis of conformationally locked carbocyclic nucleosides, including the antiviral active North-methanocarbathymidine, is reported. Starting from 2-deoxyribose the target Boc-protected amine was prepared in 33% overall yield under conditions that are
适当保护的 (1 R ,2 S ,4 S ,5 S )-4-氨基-1-(羟甲基)双环[3.1.0]己-2-醇的对映选择性合成,这是构象合成的关键原料据报道,锁定碳环核苷,包括具有抗病毒活性的 North-methanocarbathymidine。从 2-脱氧核糖开始,在比以前的方法更生态友好的条件下,以 33% 的总收率制备了目标 Boc 保护的胺。
Improved stereoselective synthesis of both methyl α- and β-glycosides corresponding to the amino sugar component of the E Ring of calicheamicin γ1I and esperamicin A1
monosaccharide component (α and β-anomer) of the E Ring of calicheamicin γ1I and esperamicin A1 has been synthetized by an efficient and improved stereoselective procedure starting from methyl 2-deoxy-α- and β-D-ribopyranoside. The synthetic procedure makes use, in each case, of a cyclic sulphate and of the regioselectiveringopening of an intermediate activated aziridine.
[EN] PROCESS FOR THE PREPARATION OF (2R.3S)-2-(HYDROXYMETHYL) -5-METHOXYTETRAHYDROFURAN-3-OL AND ACETYLATED DERIVATIVES THEREOF, FREE OF PYRANOSE COMPOUNDS<br/>[FR] PROCÉDÉ POUR LA PRÉPARATION DU (2R,3S)-2-(HYDROXYMÉTHYL)-5-MÉTHOXYTÉTRAHYDROFURAN-3-OL ET DE DÉRIVÉS ACÉTYLÉS DE CELUI-CI, EXEMPTS DE COMPOSÉS DE PYRANOSE
申请人:JOHNSON MATTHEW PLC
公开号:WO2012071508A1
公开(公告)日:2012-05-31
A method of preparing a ribofuranose derivative essentially free of pyranose compounds includes a step of contacting a solution of MDR containing MDRP as an impurity in a solvent including methanol and/or tetrahydrofuran with at least one alkali metal periodate under conditions sufficient to oxidize at least a portion of the MDRP. MDR containing at most 5 wt% of MDRP based on the total weight of MDR and MDRP may be produced.
Synthesis of 2,3’-Anhydro-2’-deoxyuridines and 2’,3’-Didehydro-2’,3’-dideoxyuridines Using Polymer Supported Fluoride
作者:Erik Larsen、Thomas Kofoed、Erik B. Pedersen
DOI:10.1055/s-1995-4070
日期:1995.9
Reaction of methyl 5-O-tert-butyldiphenylsilyl-2-deoxy-3-O-p-toluenesulfonyl-α,β-D-erythro-pentofuranoside (2) with silylated uracils 3 using trimethylsilyl trifluoromethanesulfonate (TMS triflate) as catalyst afforded after crystallization in Et2O the corresponding β-nucleosides 4. Reaction of 4 with tetrabutylammonium fluoride (TBAF) or Amberlyst A-26 resin (F--form) in THF at room temperature or at reflux gave the corresponding deprotected 2,3’-anhydro-2’-deoxyuridines 6 and 2’,3’-didehydro-2’,3’-dideoxyuridines 7, respectively.