Lithium N-Lithiomethyldithiocarbamates: New N-Alkylaminomethyl Anion Equivalents A new method for nucleophilic aminomethylation is described. It consists in the in situ conversion of a secondary methylamine to the lithium N-lithiomethyldithiocarbamate, subsequent reaction with one equivalent of an electrophile, and deprotection in a one-pot procedure to give the secondary amine substituted at the methyl group. By reaction with two equivalents of an alkyl iodide, alkyl N,N-dialkyldithiocarbamates, even mixed ones, are available too.
A Thiophene-2-carboxamide-Functionalized Zr(IV) Organic Framework as a Prolific and Recyclable Heterogeneous Catalyst for Regioselective Ring Opening of Epoxides
side chain with the linker molecule. Compound 1' was able to heterogeneously catalyze the ring-opening reaction of epoxides with amines. Catalyst 1' exhibited significant yields as well as wide substrate scope in the ringopening of epoxides by means of amines. It also displayed better catalytic performance in comparison to known MOF catalysts such as Cu3(BTC)2, Fe(BTC) (BTC: 1, 3, 5-benzenetricarboxylate)
通过使用传统的溶剂热方法合成了一种新的噻吩-2-甲酰胺官能化的Zr-UiO-66 MOF(1)。化合物1具有较高的热稳定性(在Ar气氛下高达340°C)和化学稳定性(在水中,1 M HCl和乙酸中)。活化形式为1(表示为1')的氮物理吸附测量显示出BET表面积(781 m2 / g),尽管连接分子连接了庞大的侧链。化合物1'能够多相催化环氧化物与胺的开环反应。借助于胺,在环氧化物的开环中,催化剂1'表现出显着的产率以及宽的底物范围。与已知的MOF催化剂(例如Cu3(BTC)2,Fe(BTC)(BTC:1、3、5-苯三羧酸酯)和Zr-UiO-66)相比,它还显示出更好的催化性能。在没有催化剂1'的情况下,使用游离接头Zr(IV)盐进行了对照实验,证实了1'在催化反应中的排他性作用。建立催化剂1'的可重复使用性特征至多五个连续的催化循环。详细研究了连接分子,材料1和1'的合成,表征以及催化反应的机理。
Diisopropoxyaluminium Trifluoroacetate: A New Promoter for Aminolysis of Epoxides
作者:Sriram Rampalli、Sachin S. Chaudhari、Krishnacharya G. Akamanchi
DOI:10.1055/s-2000-6235
日期:——
Aminolysis of symmetrical as well as unsymmetrical epoxides using various amines in the presence of diisopropoxyaluminium trifluoroacetate (DIPAT) as a new promoter gave 1,2-amino alcohols in excellent yields at room temperature with good to excellent selectivities.
Synthesis of chiral oxazolidinone derivatives through lipase-catalyzed kinetic resolution
作者:Yan Zhang、Yang Zhang、Yansong Ren、Olof Ramström
DOI:10.1016/j.molcatb.2015.08.004
日期:2015.12
The synthesis of enantioenriched oxazolidinone derivatives through lipase-catalyzed kineticresolution is described. The synthesis comprised a two-step, cascade acylation in one pot, resulting in a range of oxazolidinone derivatives in good yields and excellent enantiopurities.
Immobilized Pseudomonas sp. lipase: A powerful biocatalyst for asymmetric acylation of (±)-2-amino-1-phenylethanols with vinyl acetate
作者:Deniz Yildirim、S. Seyhan Tükel
DOI:10.1016/j.procbio.2013.04.019
日期:2013.5
gram of support (%) and recovered activity (%). A 4-factor and 3-level Box–Behnken design was applied for the acylation of (±)-2-(propylamino)-1-phenylethanol, a model substrate, with vinylacetate and the asymmetric acylations of other (±)-2-amino-1-phenylethanols with different alkyl substituents onto nitrogen atom such as (±)-2-(methylamino)-1-phenylethanol, (±)-2-(ethylamino)-1-phenylethanol,