Selective deprotection of TBDMS alkyl ethers in the presence of TIPS or TBDPS phenyl ethers by catalytic CuSO4·5H2O in methanol
摘要:
TBDMS alkyl ethers are efficiently cleaved to the corresponding hydroxyl compounds upon heating (conventional or microwave) in methanol solution containing 20 mol % CuSO4 center dot 5H(2)O. Intramolecular chemoselective experiments showed that TBDMS alkyl ethers are selectively cleaved in the presence of TIPS or TBDPS aryl ethers. Competition experiments also showed that TBDMS alkyl ethers were selectively cleaved in the presence of TBDPS alkyl ethers. (C) 2013 Elsevier Ltd. All rights reserved.
[EN] GLYCOLATE OXIDASE INHIBITORS FOR THE TREATMENT OF DISEASE<br/>[FR] INHIBITEURS DE GLYCOLATE OXYDASE POUR LE TRAITEMENT D'UNE MALADIE
申请人:BIOMARIN PHARM INC
公开号:WO2020257487A1
公开(公告)日:2020-12-24
Described herein are compounds, methods of making such compounds, pharmaceutical compositions and medicaments containing such compounds, and methods of using such compounds to treat or prevent diseases or disorders associated with a defect in glyoxylate metabolism, for example a disease or disorder associated with the enzyme glycolate oxidase (GO) or alterations in oxalate metabolism. Such diseases or disorders include, for example, disorders of glyoxylate metabolism, including primary hyperoxaluria, that are associated with production of excessive amounts of oxalate.
The rapid and regioselective synthesis of a series of 2,6-disubstituted dihydropyranic building-blocks bearing an oxygenated side chain is described. The corresponding 4-iodo tetrahydropyran precursors, easily prepared by Prins cyclization, underwent regioselective elimination in the presence of an In(OAc)3/LiI system to provide the title compounds. The one-pot Prins cyclization-elimination process
Synthesis of 12- and 13-Membered Sulfur-Containing Lactones by Homolytic Macrocyclization of Mercaptoacetic Esters with Alkynes
作者:Dmitry V. Demchuk、Margarita I. Lazareva、Sergey V. Lindeman、Viktor N. Khrustalyov、Yurii T. Struchkov、Rustem F. Ismagilov、Emmanuil I. Troyansky、Gennady I. Nikishin
DOI:10.1055/s-1995-3891
日期:1995.3
Starting from mercaptoacetic acid esters of 1,2- or 1,3-diols and substituted acetylenes 12- and 13-membered sulfur-containing lactones as 1:1 adducts were synthesized in yields up to 48%. The mechanism of this homolytic reaction, which is initiated by the tripropylborane/oxygen system, includes generation of thiyl radicals and their addition to the triple bond of alkynes.
Structure-reactivity relations for thiol-disulfide interchange
作者:Janette Houk、George M. Whitesides
DOI:10.1021/ja00256a040
日期:1987.10
di- and trithiols and the disulfides derived from either 2-mercaptoethanol or dithiothreitol. Reactions were conducted in methanol-d,/aqueous buffer (pH 7) or methanold, at 25 "C, using NMR spectroscopy to follow the reactions. These data were used to rank the dithiols in terms of reduction potential and to infer the structure of the disulfides formed from them on oxidation. There is a general correlation