Camphor-10-sulfonic acid catalyzed condensation of 2-naphthol with aromatic/aliphatic aldehydes to 14-aryl/alkyl-14H-dibenzo[a,j]xanthenes
作者:Kshama Kundu、Sandip Nayak
DOI:10.2298/jsc130805021k
日期:——
(±)-Camphor-10-sulfonic acid (CSA) catalyzed condensation of 2-naphthol with both aliphatic/aromatic aldehydes at 80°C yielded 14-alkyl/aryl-dibenzoxanthenes as the sole product in high yields. However, the same condensation with benzaldehyde at 25°C afforded a mixture of intermediate 1,1-bis-(2-hydroxynaphthyl)phenylmethane and 14-phenyl-dibenzoxanthene while the condensation with aliphaticaldehydes at 25°C furnished
Synthesis of 14H-dibenzo xanthene derivatives using choline chloride/tin(II) chloride deep eutectic solvent and Fe3O4/ƛ-carrageenan/Zn(II)
作者:Dana Shahabi、Hossein Tavakol
DOI:10.1007/s13738-016-0965-0
日期:2017.1
using choline chloride/tin(II) chloride (ChCl·2SnCl2) deep eutectic solvent (DES), alone, or in the presence of Fe3O4/ƛ-carrageenan/Zn(II) magnetic bionanocatalyst. In the employed procedure, 2-naphthol derivatives have mixed with aromatic or aliphatic aldehydes and the reactions have been completed in the presence of DES at 90 °C in 1.5 h. In addition, using DES/Fe3O4/ƛ-carrageenan/Zn(II), the reaction
在这项研究中,各种x吨衍生物已通过一种简单的方法有效地制备,该方法单独使用氯化胆碱/氯化锡(II)(ChCl·2SnCl 2)深共熔溶剂(DES),或在Fe 3 O 4 /ƛ-存在下进行。角叉菜胶/ Zn(II)磁性生物纳米催化剂。在所采用的方法中,将2-萘酚衍生物与芳族或脂族醛混合,并在DES存在下于90°C下于1.5小时内完成反应。另外,使用DES / Fe 3 O 4 /α-角叉菜胶/ Zn(II),反应时间减少至30分钟。所使用的DES已被回收了四次,而不会对其活性造成重大损失。
Efficient synthesis of 14-substituted-14-H-dibenzo[<i>a,j</i>]xanthenes using silica supported sodium hydrogen sulfate or amberlyst-15 catalyst
Silicasupportedsodiumhydrogensulfate (NaHSO4·SiO2) or amberlyst-15 acts as an efficient heterogeneous catalyst for the preparation of 14-alkyl and aryl-14-H-dibenzo[a,j]xanthenes with various aldehydes and β-naphthol in dichloroethane solvent in excellent yields. Synthesis of three new compounds are reported using this methodology. Recyclable nature of the amberlyst-15catalyst was also studied
Synthesis of 14-Aryl- and Alkyl-14<i>H</i>-dibenzo[a,j]xanthenes Catalyzed by Silica-supported Ferric Hydrogensulfate
作者:Hossein Eshghi、Mehdi Bakavoli、Hassanali Moradi
DOI:10.1080/00304948.2011.582003
日期:2011.1
hydrogensulfate has emerged as a promising solid acid catalyst for acid catalyzed reactions.24–30 As a continuation of our study in catalytic ability of the ferric hydrogensulfate,25–29 this work reports an efficient, mild and convenient method for the synthesis of some novel 14-substituted-14Hdibenzo[a,j]xanthenes in the presence of silica-supported ferric hydrogensulfate (SFH) Fe(HSO4)3/SiO2 (10 mol%)
Ruthenium/Yb(OTf)<sub>3</sub>-cocatalyzed dehydrogenative synthesis of 14-substituted-14-H-dibenzo[a,j]xanthenes from β-naphthol and alcohols
作者:Xiaoting Wang、Mengmeng Chen、Feng Xie、Min Zhang
DOI:10.1039/c4ra00039k
日期:——
By employing [P^O]2Cl2Ru/Yb(OTf)3 as a new and efficientcatalyst system [P^O = 2-(diphenylphosphino)-2,4-dimethylpentan-3-one], readily available, abundant alcohols were firstly employed for dehydrogenative synthesis of 14-substituted-14-H-dibenzo[a,j]xanthenes. Due to the inherent stability of alcohols compared to aldehydes, the presented synthetic protocol is adaptable to a broad substrate scope