A clean synthesis of bis(indolyl)methane and biscoumarin derivatives using P<sub>4</sub>VPy–CuO nanoparticles as a new, efficient and heterogeneous polymeric catalyst
the green, simple and highly efficient synthesis of bis(indolyl)methanes and 3,3′-(arylmethylene)bis(4-hydroxycoumarins). This methodology has some advantages such as short reaction times, environmentally friendly conditions, easy work-up, and excellent yields. This catalyst can be easily separated and re-used without any appreciable loss in its activity.
P 4 VPy-CuO纳米颗粒作为新型固体催化剂,采用超声辐照法合成,并通过X射线衍射(XRD),扫描电子显微镜(SEM),透射电子显微镜(TEM)和傅立叶变换红外光谱(FT-IR)表征)光谱学。制备的催化剂用于绿色,简单,高效的双(吲哚基)甲烷和3,3'-(芳基亚甲基)双(4-羟基香豆素)的合成。该方法具有一些优点,例如反应时间短,环境友好的条件,易于后处理和优异的收率。该催化剂可以容易地分离和重复使用,而其活性没有任何明显的损失。
Sulfonated rice husk ash (RHA-SO3H) as a highly efficient and reusable catalyst for the synthesis of some bis-heterocyclic compounds
Sulfonated rice husk ash (RHA-SO3H), a newly reported solid acid catalyst, was efficiently used for the synthesis of 4,4′-(arylmethylene)-bis-(3-methyl-1-phenyl-1H-pyrazol-5-ols), 3,3′-(arylmethylene)-bis-(4-hydroxycoumarins) and bis(indolyl)methanes. The procedure gave the products in excellent yields within very short reaction times under mild and green conditions. Also this catalyst can be reused several times without appreciable loss of its catalytic activity.
One-Pot Synthesis of Biscoumarin and Dihydropyrano[c]chromene Derivatives in the Presence of Organocatalysts under Solvent-Free Conditions
作者:Reza Heydari、Fahimeh Shahrekipour
DOI:10.2174/1570178613666160728122122
日期:2016.9.21
A simple and efficient synthesis of biscoumarin and dihydropyrano[c]chromenederivatives using catalytic amounts of imidazole or isoquinoline as organocatalyst under solvent-free conditions is reported. The present procedure offers advantages such as high to excellent yields, short reaction times, inexpensive operation, solvent-free conditions, reduced environmental consequences and simple workup.
Click chemistry‐inspired design, synthesis, and molecular docking studies of biscoumarin derivatives using carbon‐
<scp>based acid</scp>
catalyst
作者:Dinesh K. Agarwal、Ayushi Sethiya、Pankaj Teli、Anu Manhas、Jay Soni、Nusrat Sahiba、Prakash C. Jha、Shikha Agarwal、Pradeep K. Goyal
DOI:10.1002/jhet.4045
日期:——
A green and eco‐benign synthesis of biscoumarin derivativesusing carbon sulfonic acid, a solid support catalyst has been described. The reaction involved a one‐pot two‐component reaction of 4‐hydroxycoumarin and aldehyde using carbon sulfonic acid involving Knoevenegal‐Michael condensation. A series of aromatic (bearing electron withdrawing and releasing group) and heteroaromatic aldehydes has been
Thiamine hydrochloride as a recyclable organocatalyst for the synthesis of bis(indolyl)methanes, tris(indolyl)methanes, 3,3-di(indol-3-yl)indolin-2-ones and biscoumarins
作者:Sivagami Mathavan、Keerthana Kannan、Rajesh B. R. D. Yamajala
DOI:10.1039/c9ob02090j
日期:——
organocatalyst for the synthesis of a broad range of bis(indolyl)methanes in good to excellent yields. Green chemistry matrix calculations showed high atom economy and a small E-factor for the reaction. Moreover, the simple and easy operational protocol using a small amount of thiamine hydrochloride (1 mol%) makes this procedure an alternative approach for this transformation industrially. This protocol