A sustainable innovation for the tandem synthesis of sugar-containing coumarin derivatives catalyzed by lipozyme TL IM from<i>Thermomyces lanuginosus</i>in continuous-flow microreactors
作者:Li-Hua Du、Ping-Feng Chen、Rui-Jie Long、Miao Xue、Xi-Ping Luo
DOI:10.1039/d0ra00879f
日期:——
We developed an efficient and environmentally friendly two-step tandem methodology for the synthesis of sugar-containing coumarin derivatives catalyzed by lipozyme TL IM from Thermomyces lanuginosus in continuous-flow microreactors. Compared to those observed for other methods, the salient features of this work including green reaction conditions, short residence time (50 min), and catalysts are more
我们开发了一种高效且环保的两步串联方法,用于在连续流动微反应器中由嗜热霉菌的脂酶 TL IM 催化合成含糖香豆素衍生物。与其他方法相比,该工作的显着特点包括绿色反应条件、停留时间短(50分钟)、催化剂更容易获得、生物催化反应过程高效且易于控制。这种使用连续流动技术的香豆素衍生物的两步串联合成是一个概念证明,它开启了酶促微反应器在香豆素衍生物生物转化中的应用。
Three-component coupling using arynes and DMF: straightforward access to coumarins via ortho-quinone methides
作者:Hiroto Yoshida、Yu Ito、Joji Ohshita
DOI:10.1039/c1cc11955a
日期:——
ortho-Quinone methides, arising from a formal [2+2] cycloaddition between arynes and DMF, were found to facilely undergo a [4+2] cycloaddition with ester enolates or ketenimine anions to produce diverse coumarins in a straightforward manner.
Lanthanum(III)-Catalyzed Three-Component Reaction of Coumarin-3-carboxylates for the Synthesis of Indolylmalonamides and Analysis of Their Photophysical Properties
作者:Julia J. Jennings、Chinmay P. Bhatt、Annaliese K. Franz
DOI:10.1021/acs.joc.6b00541
日期:2016.8.5
First, the scandium(III)-catalyzed addition of diverse nucleophiles (e.g., indoles, N,N-dimethyl-m-anisidine, 2-ethylpyrrole, and 2-methylallylsilane) to coumarin-3-carboxylates has been developed to afford chromanone-3-carboxylates in high yields as a single diastereomer. Upon investigating a subsequent lanthanum(III)-catalyzed amidation reaction, a new multicomponent reaction was designed by bringing
This paper reports a room temperature visible‐light‐driven protocol for the intermolecular [2+2] cycloadditionsbetween coumarin‐3‐carboxylates and acrylamidesanalogs by an energy‐transfer process. Using an iridium complex FIrPic as a photosensitizer and a 3 W blue LED as a light source, an array of cyclobutabenzocypyranones were prepared in moderate to excellent yields.
KPF<sub>6</sub>-Mediated Esterification and Amidation of Carboxylic Acids
作者:Sonam、Vikki N. Shinde、Anil Kumar
DOI:10.1021/acs.joc.1c02611
日期:2022.3.4
been developed for the synthesis of esters and amides. A wide range of carboxylicacids and alcohols or amines worked well under the developed reaction conditions, thus providing good to excellent (61–98%) yields of the corresponding esters and amides. The method worked well with bioactive substrates such as cholesterol, levulinic acid, and linoleic acid. Wide substrate scope, operational simplicity