1,3,5-Trichloro-2,4,6-Triazinetrion: A Versatile Heterocycle for the One-Pot Synthesis of 14-Aryl- or Alkyl -14H-Dibenzo[a,j]xanthene, 1,8-Dioxooctahydroxanthene and 12-Aryl-8,9,10,12-Tetrahydrobenzo[a]xanthene-11-one Derivatives under Solvent-Free Conditions

Abstract

A facile, clean, green, efficient, and environmentally friendly protocol for the synthesis of the title compounds (III), (V), (VI), and (VIII) is presented.

Phosphomolybdic acid supported on Schiff base functionalized graphene oxide nanosheets: Preparation, characterization, and first catalytic application in the multi‐component synthesis of tetrahydrobenzo[a]xanthene‐11‐ones

“…They are also known as laser dyes . Among xanthene based compounds, tetrahydrobenzo[ a ]xanthene‐11‐ones are generally synthesized by one‐pot, three‐component reaction of β ‐naphthol, aldehydes, and dimedone in the presence of a variety of catalysts . Nevertheless, development of new efficient recyclable catalysts for the synthesis of these compounds was of certain demand.…”

N-Bromosuccinimide Catalyzed Three Component One-Pot Efficient Synthesis of 2,4,5-Triaryl-1H-imidazoles from Aldehyde, Ammonium Acetate, and 1,2-Diketone or α-Hydroxyketone

“…As a part of our program, seeking at development new methodologies for the preparation of heterocyclic compounds containing nitrogen [55][56][57][58][59][60] herein, we wish to describe a new and convenient protocol for the synthesis of 2,4,5-triaryl-1Himidazoles via a multicomponent reaction of aldehydes, 1,2diketone or α-hydroxyketone, and ammonium acetate in the presence of N-bromosuccinimide under solvent-free conditions (Scheme 1).…”

Heterogeneous SO3H@Fe3O4 magnetic nanocatalyst as an efficient and reusable medium for the synthesis of 3,3′‐(arylmethylene)‐bis‐(4‐hydroxycoumarin), bis‐(indolyl)‐methane, and 1,8‐dioxo‐octahydroxanthene derivatives

“…Optimization of the one-pot reaction of dimedone (6) [76] 3 17 95 184-186 185-187 [77] 4 10 98 235-238 233-235 [76] 5 10 96 253-256 254-255 [57] 6 18 94 252-255 251-253 [76] 7 18 95 171-173 170-171 [77] 8 15 97 225-228 224-226 [78] (Continues) [79] 10 10 95 223-225 221-223 [80] 11 20 92 268-270 268-271 [81] 12 18 91 244-246 246-247 [81] 13 25 91 225-227 224-226 [82] 14 32 93 212-215 210-213 [82] 15 35 92 255-257 257-258 [82] 16 20 90 254-257 256-258 [81] + and Fe 3+ solution at ambient temperature under intense mechanical stirring. In the last step, the precipitates were isolated by means of a suitable external magnetic field and rinsed several times with deionized water and dried under vacuum at 40 C for 24 hr.…”