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.
The present invention provides an immunomodulatory compound comprising a carbohydrate polymer comprising mannose, wherein the carbohydrate polymer is conjugated to at least one immune modulator. The present invention also provides for the use of this compound in immunomodulatory compositions for vaccination and gene therapy methods, together with processes for its preparation.
A Novel Type of Luciferin from the Siberian Luminous Earthworm<i>Fridericia heliota</i>: Structure Elucidation by Spectral Studies and Total Synthesis
作者:Valentin N. Petushkov、Maxim A. Dubinnyi、Aleksandra S. Tsarkova、Natalja S. Rodionova、Mikhail S. Baranov、Vadim S. Kublitski、Osamu Shimomura、Ilia V. Yampolsky
DOI:10.1002/anie.201400529
日期:2014.5.26
The structureelucidation and synthesis of the luciferinfrom the recently discovered luminous earthworm Fridericia heliota is reported. This luciferin is a key component of a novel ATP‐dependent bioluminescence system. UV, fluorescence, NMR, and HRMS spectroscopy studies were performed on 0.005 mg of the isolated substance and revealed four isomeric structures that conform to spectral data. These
Potent Synergy between Spirocyclic Pyrrolidinoindolinones and Fluconazole against<i>Candida albicans</i>
作者:Ilandari Dewage Udara Anulal Premachandra、Kevin A. Scott、Chengtian Shen、Fuqiang Wang、Shelley Lane、Haoping Liu、David L. Van Vranken
DOI:10.1002/cmdc.201500271
日期:2015.10
antifungal effect of fluconazole against Candida albicans. A diastereomer of this compound was synthesized, along with various analogues. Many of the compounds were shown to enhance the antifungal effect of fluconazole against C. albicans, some with exquisite potency. One spirocyclic piperazine derivative, which we have named synazo‐1, was found to enhance the effect of fluconazole with an EC50 value
甲spiroindolinone,(1小号,3 - [R,3α [R,6α小号)-1-苄基-6'-氯-5-(4-氟苯基)-7'-甲基螺[1,2,3一个,6一个-tetrahydropyrrolo [3,4- c ]吡咯-3,3'-1 H-吲哚] -2',4,6-三酮以前被报道可增强氟康唑对白色念珠菌的抗真菌作用。合成了该化合物的非对映异构体以及各种类似物。已显示许多化合物可增强氟康唑对白色念珠菌的抗真菌作用。s,有些具有精美的效能。发现一种螺环哌嗪衍生物,我们称为synazo-1,可增强氟康唑对敏感白念珠菌的EC 50值为300 p M的作用,对某些抗性菌株的作用低至2 n M。Synazo-1与氟康唑具有真正的协同作用,在测试菌株中FIC指数低于0.5。与抗真菌协同作用所需的浓度相比,Synazo-1在哺乳动物细胞中的毒性较低。