An efficient synthesis of naphtha[1,2-e]oxazinone and 14-substituted-14H-dibenzo[a,j]xanthene derivatives promoted by zinc oxide nanoparticle under thermal and solvent-free conditions

Synthesis of SCMNPs@imine/SO3H magnetic nanocatalyst by chlorosulfonic acid as sulfonating agents and their application for the preparation of 12-aryl-8,9,10,12-tetrahydrobenzo[a]xanthen-11-one and 1,8-dioxooctahydroxanthene derivatives

“…This illustrative method has many advantages such as selectivity, efficiency, high reaction rates, high variability, simplicity, low costs, and environmentally friendly properties [18]. Xanthenes have a broad spectrum of approved biological and pharmaceutical activities; e.g., they have been used as anti-inflammatory [19], antibacterial [20], antiviral [21] agents, and as antagonists for inhibiting the action of zoxalamine [22]. Moreover, xanthene derivatives have also been applied in laser technology [23], pH sensitive fluorescent materials [24] and photodynamic therapy [25].…”

N‐(3‐silyl propyl) diethylene triamine N,N',N''‐tri‐sulfonic acid immobilized on Fe3‐xTixO4 magnetic nanoparticles: A new recyclable heterogeneous nanocatalyst for the synthesis of hexahydroquinolines

“…Magnetic nanoparticles owing to their attractive properties, have been used as excellent support materials for preparation of MNP‐supported heterogeneous catalysts which have found wide applications in traditional metal catalysis, organocatalysis, enzyme catalysis, and industrial applications as well . Fe 2 O 3 and Fe 3 O 4 nanoparticles are the most extensively studied as the core magnetic supports, because of their high surface‐area resulting in high catalyst loading capacity, conductivity, magnetic susceptibility, catalytic activity and striking stability …”

Efficient one-pot synthesis of 14-aryl-14H-dibenzo[a,j]xanthene derivatives promoted by niobium pentachloride

“…Furthermore, 14-aryl-14H-dibenzo[a,j ]xanthene derivatives can be prepared by the condensation reaction of 2-naphthol with aryl aldehydes in the presence of different Lewis acids (Ding et al, 2007;Wang et al, 2008;Urinda et al, 2009;Wang et al, 2010;Soleimani et al, 2011;Tabatabaeian et al, 2011;Mirjalili et al, 2011;Zolfigol et al, 2012;Rao et al, 2012;Cao et al, 2013) and Brønsted acids (Gong et al, 2009;Hajipour et al, 2010;Rahmatpour, 2011;Ghassamipour & Sardarian, 2012;Zare et al, 2012).…”

“…Several metallic Lewis acids (Saini et al, 2006;Wang et al, 2008Wang et al, , 2010Urinda et al, 2009;Soleimani et al, 2011;Tabatabaeian et al, 2011;Mirjalili et al, 2011;Rao et al, 2012;Zolfigol et al, 2012;Cao et al, 2013) have been employed as catalysts in this type of reaction whilst, in the current work, studies on the use of niobium pentachloride (NbCl 5 ) as a catalyst in these one-pot reactions are reported. NbCl 5 forms chloro-bridged dimers in its solid state in which each niobium atom is surrounded by a distorted octahedron of chlorine atoms.…”