1019516-04-1Relevant articles and documents
Copper nanoparticles (CuNPs) catalyzed chemoselective reduction of nitroarenes in aqueous medium
Chand, Dillip Kumar,Rai, Randhir
, (2021/08/20)
Abstract: A procedure for practical synthesis of CuNPs from CuSO4·5H2O is established, under appropriate reaction conditions, using rice (Oryza sativa) as an economic source of reducing as well as a stabilizing agent. Optical and microscopic techniques are employed for the characterization of the synthesized CuNPs and the sizes of the particles were found to be in the range of 8 ± 2 nm. The nanoparticles are used as a catalyst for chemoselective reduction of aromatic nitro compounds to corresponding amines under ambient conditions and water as a reaction medium. Graphic abstract: CuNPs are synthesized using hydrolysed rice and used as catalyst for chemoselective reduction of nitroarenes to their corresponding amines in water. [Figure not available: see fulltext.]
Synthesis and biological evaluation of new 4β-anilino-4′-O- demethyl-4-desoxypodophyllotoxin derivatives as potential antitumor agents
Wang, Li,Yang, Fenyan,Yang, Xiaochun,Guan, Xianghong,Hu, Chunqi,Liu, Tao,He, Qiaojun,Yang, Bo,Hu, Yongzhou
scheme or table, p. 285 - 296 (2011/03/17)
A series of new 4β-anilino-4′-O-demethyl-4-desoxypodophyllotoxin derivatives were prepared and evaluated for their cytotoxicities against four human cancer cell lines including KB, KB/VCR, A549 and 95D. Most compounds showed better growth-inhibition activities against tested cell lines than that of etoposide (VP-16). Preliminary structure-activity relationships (SARs) were concluded and it indicated that the side chains substituted at 4β position of podophyllotoxin significantly influenced the cytotoxic activity, especially for the drug resistance profile. In vivo studies of compound 26c on highly metastatic human lung cancer xenograft in nude mice showed that it can significantly inhibit tumor growth with administrating by oral route.
4-Pivaloylaminobenzyl ether, a new temporary protection for hydroxyl functions
Fukase, Koichi,Yoshimura, Takuya,Hashida, Manabu,Kusumoto, Shoichi
, p. 4019 - 4022 (2007/10/02)
4-Pivaloylaminobenzyl (PAB) group is a new benzyl-type protecting group which can be introduced either by initial introduction of 4-nitrobenzyl group followed by reduction and N-acylation or by the reaction of a hydroxyl compound with the corresponding halogenide or trichloroacetimidate. PAB ethers have higher acid stability than 4-methoxybenzyl ethers but are readily cleaved with DDQ in a manner similar to the latter.