Brønsted Acidic Ionic Liquid as an Efficient and Reusable Catalyst for Synthesis of 14-Aryl- or 14-Alkyl-14H-dibenzo[a,j]xanthenes under Solvent-Free Conditions
and efficient method has been developed for the preparation of 14-aryl- or 14-alkyl-14H-dibenzo[a,j]xanthenes from one-pot condensation of aldehydes with 2-naphthol using catalytic amount of Bronsted acidic ionic liquid ([TEBSA][HSO 4 ]) underthermalsolvent-freeconditions. Excellent yields, short reaction times, easy workup and reusability of the catalyst as well as solvent-freeconditions are advantages
Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>–imid–PMA<sup>n</sup>magnetic porous nanospheres as recyclable catalysts for the one-pot synthesis of 14-aryl- or alkyl-14H-dibenzo[a,j]xanthenes and 1,8-dioxooctahydroxanthene derivatives under various conditions
environmentally-friendly protocol for the synthesis of 14-aryl- or alkyl-14H-dibenzo[a,j]xanthenes and 1,8-dioxooctahydroxanthenes has been developed by one-pot condensation of various aldehydes with (i) β-naphthol and (ii) cyclic 5,5-dimethyl-1,3-cyclohexanedione, in the presence of Fe3O4@SiO2–imid–H3PMo12O40 nanoparticles as magnetic catalystsunder various conditions. Different types of aromatic and aliphatic
一种简便,对于14芳基-或烷基- 14合成高效和环境友好的协议ħ -二苯并[一,Ĵ ]呫吨,1,8-二dioxooctahydroxanthenes已经开发通过与各种醛的一锅缩合(ⅰ )在存在Fe 3 O 4 @SiO 2 –酰亚胺–H 3 PMo 12 O 40的条件下,β-萘酚和(ii)环状5,5-二甲基-1,3-环己二酮纳米粒子在各种条件下作为磁性催化剂。反应中使用了不同类型的芳香族和脂肪族醛,并且在所有情况下均成功合成了产物。本方法具有几个优点,例如反应时间短,收率高,易于纯化,反应更清洁以及通过磁场容易回收和再利用催化剂。另外,上述纳米催化剂可以容易地通过磁场回收,并且至少5次重复用于后续反应,而催化活性没有显着降低。
A Clean, Mild, and Efficient Preparation of Aryl 14H-benzo[a,j]xanthene leuco-dye Derivatives Via Nanocatalytic MCM-41-SO3H Under Ultrasonic Irradiation in Aqueous Media
作者:Mostafa Fathollahi、Shahnaz Rostamizadeh、Ali M. Amani
DOI:10.2174/1386207321666180104111508
日期:2018.3.20
AIM AND OBJECTIVE The present study has developed an efficient and eco-friendly protocol for the synthesis of aryl-14-H-dibenzo[a,j] xanthenes through a one-pot condensation reaction of 2-naphthol and arylaldehydes in aqueousmedia using the nanocatalytic MCM-41-SO3H under ultrasonic illumination. MATERIAL AND METHODS Using SEM and XRD analyses, MCM-41-SO3H nanoparticles were characterized. Therefore
Heterogeneous catalyst: Amberlyst-15 catalyzes the synthesis of 14-substituted-14H-dibenzo[a,j]xanthenes under solvent-free conditions
作者:Shengkai Ko、Ching-Fa Yao
DOI:10.1016/j.tetlet.2006.10.072
日期:2006.12
A one-pot condensation of β-naphthol with aldehydes in the presence of Amberlyst-15 to give 14-substituted-14H-dibenzo[a,j]xanthenesundersolvent-free condition is described.
Epoxides as a new feedstock for the synthesis of xanthene derivatives by using highly efficient, reusable tungstated zirconia heterogeneous catalyst
作者:Venkata Subba Rao Ganga、Manoj K. Choudhary、Rajkumar Tak、Prathibha Kumari、Sayed H.R. Abdi、Rukhsana I. Kureshy、Noor-ul H. Khan
DOI:10.1016/j.catcom.2017.01.001
日期:2017.5
This paper reports the synthesis of tungstated zirconia (WOx/ZrO2) by sol-gel technique and its characterization with XRD, FT-IR, Raman, TGA, N2 adsorption–desorption isotherms, NH3-TPD, SEM, and TEM analysis. The catalyst was used for a new one-pot synthesis of biologically active xanthenederivatives (yield up to 94%) by using readily available epoxides and 2-naphthol/sesamol. The catalytic performance
本文报道了溶胶-凝胶法合成钨酸锆(WO x / ZrO 2)及其XRD,FT-IR,拉曼,TGA,N 2吸附-解吸等温线,NH 3 -TPD,SEM和TEM的表征。分析。通过使用容易获得的环氧化物和2-萘酚/芝麻酚,该催化剂用于生物活性x吨衍生物的新的一锅合成(收率高达94%)。与其他催化剂,即H 3 [P(W 3 O 10)4 ]·xH 2相比,WO x / ZrO 2的催化性能更好。O,HPA-氧化锆,HPA-MCM-41,Amberlist-15,硫酸化的二氧化硅和硫酸化的氧化锆,特别是在可回收性方面。该方法简便,快速,清洁,可重复使用(6个循环),并且高产率地合成for吨衍生物。