Photochemical desulfurization of thiols and disulfides
摘要:
A visible light-induced desulfurization process for thiols and disulfides using triethylphosphite and triethylborane is reported. The reaction can be effected on a range of organic molecules having either primary, secondary or tertiary thiol groups and disulfides without the need of protecting groups. Thus, after treating L-cystine 7, L-cystine dimethylester 8, thioctic amide 9 and glutathione disulfide 10, first with tributylphosphine, later with triethylborane/triethylphosphite under irradiation in a one-pot reaction, the corresponding desulfurized compounds L-Ala, L-Ala, 1-octanamide and gamma-L-Glu-L-Ala-Gly, respectively, are prepared in high yields with retention of configuration. (C) 1999 Elsevier Science Ltd. All rights reserved.
[EN] PRODRUGS OF KETAMINE, COMPOSITIONS AND USES THEREOF<br/>[FR] PROMÉDICAMENTS À BASE DE KÉTAMINE, COMPOSITIONS ET UTILISATIONS DE CEUX-CI
申请人:XW LAB INC
公开号:WO2019137381A1
公开(公告)日:2019-07-18
Provided are prodrugs of (S) -or (R) -ketamine, including isotopically labeled ketamine,composition and uses thereof. Compounds having formula (Ia) or (Ib) as the prodrugs of (S) -or (R) -ketamine, including isotopically labeled ketamine, and pharmaceutical compositions comprising the compounds provided herein are used for treating or preventing a CNS disease.More particularly, the related diseases include depression and pain. (Ia) (Ib)
A study of fragmentation of protonated amides of some acylated amino acids by tandem mass spectrometry: observation of an unusual nitrilium ion
作者:Erach R. Talaty、Sarah M. Young、Ryan P. Dain、Michael J. Van Stipdonk
DOI:10.1002/rcm.4965
日期:2011.5.15
ionization (ESI) was conducted. Among the fragment ions observed was an unusual one, which we have determined to be a nitrilium ion having the structure or by loss of the full mass of glycine as a neutral fragment. A mechanism that we propose involves an initial protonation of the oxygen atom at the N‐terminus, followed by cyclization to a five‐membered imidazolium ring, and its subsequent collapse to
Red‐Shifted Substrates for FAST Fluorogen‐Activating Protein Based on the GFP‐Like Chromophores
作者:Natalia V. Povarova、Snizhana O. Zaitseva、Nadezhda S. Baleeva、Alexander Yu. Smirnov、Ivan N. Myasnyanko、Marina B. Zagudaylova、Nina G. Bozhanova、Dmitriy A. Gorbachev、Kseniya K. Malyshevskaya、Alexey S. Gavrikov、Alexander S. Mishin、Mikhail S. Baranov
DOI:10.1002/chem.201901151
日期:2019.7.22
A genetically encoded fluorescent tag for livecell microscopy is presented. This tag is composed of previously published fluorogen‐activating protein FAST and a novel fluorogenic derivative of greenfluorescentprotein (GFP)‐like chromophore with red fluorescence. The reversible binding of the novel fluorogen and FAST is accompanied by three orders of magnitude increase in red fluorescence (580–650 nm)
Abstract Easily accessible 1-(N-acylamino)alkyltriphenylphosphonium salts react smoothly with nitrogen, sulfur, phosphorus and oxygen nucleophiles in the presence of (i-Pr)2EtN to give the expected α-amidoalkylation products, usually in good or very good yields. α-Amidoalkylation of dialkyl malonates or acetylacetates requires the application of a much stronger base (DBU) and gives the best results