合成了一系列四个在吲哚烯部分3位带有手性中心,正丙基或苯基与甲基并排的甲基吲哚肾上腺体,并以≥98%的高纯度获得了所需的立体异构体。使用周环反应级联反应不对称合成手性中心带有苯基的吲哚啉前体,其ee高达98%,而正丙基的吲哚前体则通过不对称氢化的动力学拆分而制备。 ee最高可达98%。X射线晶体学分析显示,苯基取代的类固醇方酸方酸衍生物的几何结构略有扭曲,而n丙基取代的衍生物具有预期的平面几何形状。取代基的变化也影响了光学性能,其中引入苯基导致逐步的红移和平方跃迁矩的减小,以及降低的荧光量子产率,斯托克斯位移和荧光寿命。所有被研究的化合物均表现出较强的ECD信号,HOMO-LUMO跃迁的Δε值高达24 M –1 cm –1。DFT计算表明,这是由于较大的电和磁跃迁力矩造成的,尽管两个矢量相互几乎是正交的。
合成了一系列四个在吲哚烯部分3位带有手性中心,正丙基或苯基与甲基并排的甲基吲哚肾上腺体,并以≥98%的高纯度获得了所需的立体异构体。使用周环反应级联反应不对称合成手性中心带有苯基的吲哚啉前体,其ee高达98%,而正丙基的吲哚前体则通过不对称氢化的动力学拆分而制备。 ee最高可达98%。X射线晶体学分析显示,苯基取代的类固醇方酸方酸衍生物的几何结构略有扭曲,而n丙基取代的衍生物具有预期的平面几何形状。取代基的变化也影响了光学性能,其中引入苯基导致逐步的红移和平方跃迁矩的减小,以及降低的荧光量子产率,斯托克斯位移和荧光寿命。所有被研究的化合物均表现出较强的ECD信号,HOMO-LUMO跃迁的Δε值高达24 M –1 cm –1。DFT计算表明,这是由于较大的电和磁跃迁力矩造成的,尽管两个矢量相互几乎是正交的。
A series of 15 benzene-fused hexahydropyrrolo[1,2-b]isoquinolonic acids with substantial degree of steric encumbrance has been prepared via a novel variant of the Castagnoli-Cushman reaction of homophthalic anhydride (HPA) and various indolenines. The employment of a special kind of a cyclic imine component reaction allowed, for the first time, isolating a Mannich-type adduct between HPA and an imine
The invention provides a novel class of cyanine dyes that are functionalized with sulfonic acid groups and a linker moiety that facilitates their conjugation to other species and substituent groups which increase the water-solubility, and optimize the optical properties of the dyes. Also provided are conjugates of the dyes, methods of using the dyes and their conjugates and kits including the dyes and their conjugates.
The invention provides a novel class of cyanine dyes that are functionalized with a linker moiety that facilitates their conjugation to other species and substituent groups which increase the water-solubility, and optimize the optical properties of the dyes. Also provided are conjugates of the dyes, methods of using the dyes and their conjugates and kits including the dyes and their conjugates.
The invention provides a novel class of cyanine dyes that are functionalized with a linker moiety that facilitates their conjugation to other species and substituent groups which increase the water-solubility, and optimize the optical properties of the dyes. Also provided are conjugates of the dyes, methods of using the dyes and their conjugates and kits including the dyes and their conjugates.
<i>N</i>-Indolyltriethylborate: A Useful Reagent for Synthesis of C3-Quaternary Indolenines
作者:Aijun Lin、Jiong Yang、Mohamed Hashim
DOI:10.1021/ol4005992
日期:2013.4.19
N-Indolyltriethylborate was found to be a useful reagent for dearomatizing C3-alkylation of 3-substituted indoles with both activated and nonactivated alkyl halides to give C3-quaternary indolenines, pyrroloindolines, furoindoline, and hexahydropyridoindoline under mild reaction conditions. The utility of these reagents was demonstrated in the syntheses of a pyrroloindoline-4-cholestene hybrid and debromoflustramine B.