Rapid access to oxazine fused furocoumarins and in vivo and in silico studies of theirs biological activity

Background: The synthesis of 1,2-oxazine-fused linear furocoumarins was performed involving the transition metal catalysis reaction of plant coumarin oreoselone derivatives. Objective and Method: The Pd-catalyzed desulfonative cross-coupling reactions of 2-(tosyl)oreoselone with terminal alkynes and the successive treatment of the obtained 2-(arylethynyl)furocoumarins with an excess of hydroxylamine gave the expected (Z,E)-3-(hydroxyimino)-2-(arylethynyl)furocoumarins with an (Z:E) ratio of about 1:0.5. The gold(III)-catalyzed cycloisomerization of furocoumarin ß,?-acetylenic (Z)-oximes led to a new group of heterocyclic compounds-chromeno[6',7':4,5]furo[3,2-c][1,2]oxazine. The (E)-isomer in this condition was transformed into (E)-3-(hydroxyimino)-2-(propan-2-ylidene) furocoumarin. Results: Pharmacological screening of the synthesized 1,2-oxazine-fused linear furocoumarins for anti-inflammatory and analgesic activity in vivo revealed that this compounds possessed high activity which was depend on the substitution in the aromatic ring of the oxazine unit. The results of experimental studies were found to be in accordance with that of the in silico docking results. Conclusion: The moderate toxicity of compounds (LD50 value was more than 2000 mg/kg) encouraged the further design of therapeutically relevant analogues based on this novel type of fused linear furocoumarins. © 2017 Bentham Science Publishers

Rapid access to oxazine fused furocoumarins and in vivo and in silico studies of theirs biological activity

Background: The synthesis of 1,2-oxazine-fused linear furocoumarins was performed involving the transition metal catalysis reaction of plant coumarin oreoselone derivatives. Objective and Method: The Pd-catalyzed desulfonative cross-coupling reactions of 2-(tosyl)oreoselone with terminal alkynes and the successive treatment of the obtained 2-(arylethynyl)furocoumarins with an excess of hydroxylamine gave the expected (Z,E)-3-(hydroxyimino)-2-(arylethynyl)furocoumarins with an (Z:E) ratio of about 1:0.5. The gold(III)-catalyzed cycloisomerization of furocoumarin ß,?-acetylenic (Z)-oximes led to a new group of heterocyclic compounds-chromeno[6',7':4,5]furo[3,2-c][1,2]oxazine. The (E)-isomer in this condition was transformed into (E)-3-(hydroxyimino)-2-(propan-2-ylidene) furocoumarin. Results: Pharmacological screening of the synthesized 1,2-oxazine-fused linear furocoumarins for anti-inflammatory and analgesic activity in vivo revealed that this compounds possessed high activity which was depend on the substitution in the aromatic ring of the oxazine unit. The results of experimental studies were found to be in accordance with that of the in silico docking results. Conclusion: The moderate toxicity of compounds (LD50 value was more than 2000 mg/kg) encouraged the further design of therapeutically relevant analogues based on this novel type of fused linear furocoumarins. © 2017 Bentham Science Publishers

Expedient approach to 6-bromo-2-isopropylidenecoumaranone, a potential intermediate for the synthesis of TMC-120B, pseudodeflectusin, and Their congeners

A straightforward approach toward 6-bromo-2-isopropylidenecoumaranone, a potential intermediate toward alkaloid TMC 120-B, pseudodeflectusin, and other natural products, was reported. The synthetic sequence involved the reaction of 3-bromosalicylaldehyde with chloroacetone and cyclization of the resulting ether to a 2-acetylcoumaranol intermediate. This was followed by sequential methyl Grignard addition and Jones’ oxidation to the corresponding coumaranone, which was dehydrated to the final product with the methanesulfonyl chloride/pyridine reagent. The protection of the coumaranol as the corresponding THP-ether resulted in improved product yields.Fil: Pergomet, Jorgelina Leonor. Universidad Nacional de Rosario. Facultad de Ciencias Bioquímicas y Farmacéuticas. Instituto de Química Rosario (IQUIR-CONICET); Argentina.Fil: Kaufman, Teodoro Saúl. Universidad Nacional de Rosario. Facultad de Ciencias Bioquímicas y Farmacéuticas. Instituto de Química Rosario (IQUIR-CONICET); Argentina.Fil: Bracca, Andrea Beatriz Juana. Universidad Nacional de Rosario. Facultad de Ciencias Bioquímicas y Farmacéuticas. Instituto de Química Rosario (IQUIR-CONICET); Argentina

Synthesis and Cytotoxic Activity of a New Group of Heterocyclic Analogues of the Combretastatins

A series of new analogs of combretastatin A-4 (CA-4, 1) with the A or B-ring replaced by a 3-oxo-2,3-dihydrofurocoumarin or a furocoumarin residue have been designed and synthesized by employing a cross-coupling approach. All the compounds were evaluated for their cytotoxic activity with respect to model cancer cell lines (CEM-13, MT-4, U-937) using conventional MTT assays. Structure-activity relationship analysis reveals that compounds 2, 3, 6–8 in which the (Z)-styryl substituent was connected to the 2-position of the 3-oxo-2,3-dihydrofurocoumarin core, demonstrated increased potency compared to 3-(Z)-styrylfurocoumarins 4, 5, 9–11. The methoxy-, hydroxyl- and formyl- substitution on the aromatic ring of the (Z)-styryl moiety seems to play an important role in this class of compounds. Compounds 2 and 3 showed the best potency against the CEM-13 cell lines, with CTD50 values ranging from 4.9 to 5.1 μM. In comparison with CA-4, all synthesized compounds presented moderate cytotoxic activity to the T-cellular human leucosis cells MT-4 and lymphoblastoid leukemia cells CEM-13, but most of them were active in the human monocyte cell lines U-937

Chemistry for Sustainable Development 18 (2010) 381388 Synthesis and Investigation of the Pharmacological Activity of Oreoselone Nitrogen-Containing Derivatives

Abstract The bromin ation of peucedanine using different reagents resulted in the formation of 2-bromoreoselone. Via the reaction with the derivatives of pi peridine and pi perazine we synthesized 2-pi perazino and 2-pi peridino derivatives of oreoselone. Conditions were determined for the formation of 2-(1,3-dibromopropane-2-ylidene)-2Í-furo-[3,2-g][1]-benzopyran-3,7-dione. The interaction of the latter with tyramine resulted in obtaining bis(diaminophenethyl) derivative of furocoumarin. The amin ation of the mentioned dibromide with the help of spermine resulted in the formation of a macrocyclic compound containing both furocoumarin and polyamine fragments. The effect of novel oreoselone derivatives on the central nervous system was investigated