Xanthene

About: Xanthene is a research topic. Over the lifetime, 2132 publications have been published within this topic receiving 34803 citations. The topic is also known as: Xanthene & dibenzo[a,e]pyran.

Anthracene-9, 10-dione dioxime compound prodrugs and their uses

Abstract: Chemical agents, such as disulfonamide derivatives of fluorene, anthracene, xanthene, dibenzosuberone and acridine, and similar heterocyclic ring structures; including, salts thereof that act as anti-cancer and anti-tumor agents, along with methods for preparing such agents, as well as pharmaceutical compositions containing such agents as active ingredients and methods of using these as therapeutic agents.

Diels—Alder Trapping of ortho-Quinone Methides. A New Entry to Substituted Xanthene-1,4-diones.

Abstract: Highly regioselective Diels–Alder reactions of a non-protected β -hydroxy quinone have been achieved after formation of chelated lithium alkoxides. In this report, we demonstrate on a model system, that the selectivity of reactions based on 1,3-dioxy-substituted quinones can be efficiently controlled by the addition of Lewis acid (AlMe 3 ), which chelates the substrate by the two oxygens.

Chiral single phosphorus ligand PC-Phos based on xanthene framework, preparation method of full structure of ligand and application

Abstract: The invention discloses a novel single phosphorus ligand PC-Phos of a xanthene framework. The ligand is a compound as shown in a formula (1) or an enantiomer, racemate or diastereoisomer of the compound as shown in the specification. The invention further discloses a preparation method of the ligand. A formula 2 and a formula 4 as shown in the specification serve as raw materials, and substitution reaction, addition reaction, condensation reaction and reduction reaction are performed to prepare the ligand. Alternatively, a formula 6 and the formula 4 as shown in the specification serve as raw materials, are subjected to condensation reaction and subjected to addition reaction with a formula as shown in the specification to prepare the ligand. Chiral sulfonamide 4 with two structures and different types of metallic reagents are subjected to addition reaction, and optical voidness of four full structures 1 (S, Rs), 1 (R, Rs), 1 (S, Ss) and 1 (R, Ss) of the chiral single phosphorus ligand can be obtained. The invention further discloses an application of the ligand to asymmetric cyclization reaction in catalytic allene amine molecules. The ligand has quite high reaction activity, stereo-selectivity and wide application values.

Facile and rapid synthesis of divers xanthene derivatives using Lanthanum(III) chloride/chloroacetic acid as an efficient and reusable catalytic system under solvent-free conditions

Abstract: LaCl 3 /ClCH 2 COOH was used as an efficient, and recyclable catalytic system for synthesis of 8H-benzo[a]xanthe, hexahydro-1H-xanthene and pyran-10,12(11H)-dione derivatives via a one-pot three-component reaction of aldehydes, 2-naphthol, and cyclic 1,3-dicarbonyl compounds. The reactions proceeded rapidly at 70 o C under solvent-free conditions and the desired products were obtained in good to excellent yields.