1,1-Dioxonaphtho[1,2-<i>b</i>]thiophene-2-methyloxycarbonyl (α-Nsmoc) and 3,3-Dioxonaphtho[2,1-<i>b</i>]thiophene-2-methyloxycarbonyl (β-Nsmoc) Amino-Protecting Groups
作者:Louis A. Carpino、Adel Ali Abdel-Maksoud、Dumitru Ionescu、E. M. E. Mansour、Mohamed A. Zewail
DOI:10.1021/jo062397g
日期:2007.3.1
mechanistically similar to that previously established for the Bsmoc derivative in that the reaction is initiated by Michael addition to the β-carbon atom of the α,β-unsaturatedsulfone system. Application of α- and β-Nsmoc amino acids to the solid-phase synthesis of two model peptides was examined. An advantage of the α-Nsmoc system over the long-known Bsmoc system proved to be the milder conditions needed for
在Bsmoc相关的,基于萘噻吩砜基的氨基保护基的三个理论上可能的替代基团中,最易获得的两个衍生物α-和β-Nsmoc类似物已作为Bsmoc残基的替代品进行了研究。油性受保护的氨基酸或氨基酸氟化物。所有的萘系统均提供易于处理的固体氨基酸衍生物。用作引入α-Nsmoc保护基的关键试剂的中间体砜醇11很容易由α-四氢萘酮制备(方案1)。对应的β-类似物17类似地,在小规模上进行制备,但由于β-四氢萘酮的成本高,因此将罗丹宁与α-萘醛反应的替代途径用于大规模工作(方案2)。所有蛋白原氨基酸都转化为它们的α-和β-Nsmoc衍生物。脱保护研究表明,哌啶对脱保护的反应性依次为α-Nsmoc> Bsmoc>β-Nsmoc。1个1 H NMR实验表明,两个新系统的解封在机理上与先前为Bsmoc衍生物建立的解封在机理上相似,因为该反应是通过将迈克尔加成到α,β-不饱和砜系统的β-碳原子上而引发的。研究了α-
Water soluble multi-biotin-containing compounds
申请人:Wilbur Scott D.
公开号:US20060228325A1
公开(公告)日:2006-10-12
Water-soluble discrete multi-biotin-containing compounds with at least three (3) biotin moieties are disclosed. The water-soluble biotin-containing compounds may additionally comprise one or more moieties that confer resistance to cleavage by biotinidase or that is cleavable in vitro or in vivo. The discrete multi-biotin-containing compounds may include a reactive moiety that provides a site for reaction with yet another moiety, such as a targeting, diagnostic or therapeutic functional moiety. Biotinylation reagents comprising water-soluble linker moieties are also disclosed and may additionally comprise a biotinidase protective group. Methods for amplifying the number of sites for binding biotin-binding proteins at a selected target using multi-biotin compounds also are disclosed.
O‐to‐S Substitution Enables Dovetailing Conflicting Cyclizability, Polymerizability, and Recyclability: Dithiolactone vs. Dilactone
作者:Yanchao Wang、Maosheng Li、Jinlong Chen、Youhua Tao、Xianhong Wang
DOI:10.1002/anie.202109767
日期:2021.10.4
chemically recyclable polymers represents a greener alternative to landfill and incineration and offers a closed-loop strategy toward a circular materials economy. However, the synthesis of chemically recyclable polymers is still plagued with certain fundamental limitations, including trade-offs between the monomer's cyclizability and polymerizability, as well as between polymer's depolymerizability and
A process for producing &agr;-aminohalomethyl ketones or N-protected &agr;-aminohalomethyl ketones from specified 3-oxazolidin-5-one derivatives via 5-halomethyl-5-hydroxy-3-oxazolidine derivatives. By this process, &agr;-aminohalomethyl ketones and compounds relating to them can be obtained efficiently and economically in industrial scale.
[EN] TARGETED PLASMA PROTEIN DEGRADATION<br/>[FR] DÉGRADATION CIBLÉE DE PROTÉINES DE PLASMA
申请人:NOVARTIS AG
公开号:WO2021156792A1
公开(公告)日:2021-08-12
The present invention is directed to the bifunctional compounds and the use of such bifunctional compounds to lower plasma levels of extracellular target molecules by lysosomal degradation. Such bifunctional compounds have a cell surface receptor ligand covalently linked to a ligand that is capable of binding to an extracellular target molecule (such as a ligand for a growth factor, a cytokine, a chemokine, a hormone, a neurotransmitter, a capsid, a soluble receptor, an extracellular secreted protein, an antibody, a lipoprotein, an exosome, a virus, a cell, or a plasma membrane protein), where the cell surface receptor is associated with receptor mediated endocytosis, including asialoglycoprotein receptor (ASGPR) mediated lysosomal degradation and mannose-6-phosphate (M6PR) mediated lysosomal degradation. Pharmaceutical compositions comprising such bifunctional compounds and methods of treating a disease or disorder mediated by an extracellular molecule using such bifunctional compounds are also provided herein.