Two novel Fmoc-derived protectinggroups, Mio-Fmoc and Dio-Fmoc, were developed, which cause dramatically enhanced solubility of the corresponding derivatives in most organic solvents. Furthermore, the suitability of these groups in solid-phase peptide synthesis was highlighted.
A modular approach for the synthesis of molecular rods based on oligospiroketals has been developed. The strategy relies on different terminal and intermediate segments, which are joined by ketal formation between ketones and diols. For this purpose it was necessary to develop a new ketalization method to circumvent some problems related with the established methods. The terminal segments are either
<i>N</i>-Bromosuccinimide (NBS) Catalyzed Highly Chemoselective Acetalization of Carbonyl Compounds Using Silylated Diols and Pentaerythritol under Neutral Aprotic Conditions
作者:Babak Karimi、Hassan Hazarkhani、Jafar Maleki
DOI:10.1055/s-2004-837291
日期:——
Various types of carbonylcompounds are efficiently convened to their 1,3-dioxanes and pentaerythritol diacetals by the use of either 1,3-bistrimethylsiloxy propane (A) or 1,3-bistrimethylsilanyloxy-2,2-bistrimethylsilanyloxymethyl propane (D) and a catalytic amount of N-bromosuccinimide (3-10 mol%) under essentially neutral aprotic condition, respectively. A variety of functionalities such as both
Synthesis and Spectroscopic Characterization of Fluorophore-Labeled Oligospiroketal Rods
作者:Anne Techen、Sylvia Czapla、Kristian Möllnitz、Dennis Budach、Pablo Wessig、Michael U. Kumke
DOI:10.1002/hlca.201200616
日期:2013.11
attachment of the dyes was accomplished by 1,3‐dipolar cycloaddition between alkynes and azides (‘click’ reaction) and is a prime example for a novel class of sensor constructs. Especially, the attachment of two (different) fluorophores on opposite sides of the molecular rods paves the way to new sensor systems with less bulky (compared to the conventional DNA‐ or protein‐based concepts), nevertheless rigid
研究了由完善的荧光团与基于螺烷型结构的刚性分子棒组成的荧光探针在不同溶剂条件下的荧光性质。染料的附着是通过炔烃与叠氮化物之间的1,3-偶极环加成反应(“点击”反应)完成的,这是新型传感器构造的一个主要例子。特别是,对分子杆的相对侧的两个(不同的)的荧光团的附接铺平了道路到新的传感器系统与体积较小(相对于传统的基于DNA或蛋白质的概念),不过刚性间隔构建体,例如,用于基于FRET的传感应用。在MeOH中进行了详细的光物理特性(和基本的H 2 O / MeOH混合物),用于我的含羧基)杆构建体,II),含羧基杆构建体III)同时含有羧基和羧基杆构建体,和IV)杆构建体含有pyr和per部分。对于每种染料(对),合成并研究了具有不同螺环单元数的两个杆长。棒构建体在集合以及单分子荧光实验中针对i)特定棒染料和ii进行了表征)染料染料相互作用。除了MeOH和MeOH / NaOH外,还在胶束系统
Ester-urethane derivatives of (meth)-acrylic acid for dental materials
申请人:Bayer Aktiengesellschaft
公开号:US04904750A1
公开(公告)日:1990-02-27
Dental fillings, coatings and teeth are formed of polymers and copolymers of a polyfunctional ester-urethane derivative of (meth)-acrylic acid of the formula ##STR1## in which A is a straight-chain or branched aliphatic radical which has 2 to 20 carbon atoms and optionally contains 1 to 3 oxygen bridges, an aromatic radical with 6 to 24 carbon atoms, an araliphatic radical with 7 to 26 carbon atoms or a cycloaliphatic radical with 6 to 26 carbon atoms, r denotes the number of chains starting from A and denotes a number from 2 to 6, R.sup.1 and R.sup.2 are identical and denote hydrogen or are different and denote hydrogen and methyl, n denotes a number from 0 to 5 independently for each chain starting from A, X stands for the group ##STR2## in which Y denotes a divalent (cyclo)aliphatic radical which has 2 to 15 carbon atoms and optionally contains ester, ether or urethane groups, Z denotes a divalent straight-chain or branched aliphatic hydrocarbon radical which has 3 to 15 carbon atoms and can optionally contain 1 to 3 oxygen bridges and can optionally be substituted by 1 to 4 additional (meth)-acrylate radicals and R.sup.3 denotes hydrogen or methyl independently for each chain starting from A.