61038-90-2Relevant articles and documents
A practical method for the oxidative coupling of aromatic compounds
Tanaka, Masahide,Mitsuhashi, Hiroshi,Wakamatsu, Takeshi
, p. 4161 - 4164 (1992)
A practical method for the oxidative coupling reaction of phenolic and nonphenolic compounds is described. The versatility of this reaction was demonstrated by the successful coupling of the wide variety of substrates including catecholic compounds and known intermediates for the synthesis of steganacin and its analogs.
Oxidative cyclisation of cis- and trans-2,3-dibenzylbutyrolactones using ruthenium tetra(trifluoroacetate)
Ward, Robert S,Hughes, David D
, p. 4015 - 4022 (2001)
A series of cis- and trans-2,3-dibenzylbutyrolactones have been synthesised and subjected to oxidative cyclisation using ruthenium tetra(trifluoroacetate) affording dibenzocyclooctadiene lactones belonging to the stegane and isostegane series of lignans.
Antineoplastic Agents. 522. Hernandia peltata (Malaysia) and Hernandia nymphaeifolia (Republic of Maldives)
Pettit, George R.,Meng, Yanhui,Gearing, R. Patrick,Herald, Delbert L.,Pettit, Robin K.,Doubek, Dennis L.,Chapuis, Jean-Charles,Tackett, Larry P.
, p. 214 - 220 (2004)
Bioassay (P388 lymphocytic leukemia cell line and human tumor cell lines)-guided separation of the extracts prepared from the tropical and coastal trees Hernandia peltata (Malaysia) and Hernandia nymphaeifolia (Republic of Maldives) led to the isolation of a new lignan designated as hernanol (1) and 12 previously known lignans: (-)-deoxypodophyllotoxin (2), deoxypicropodophyllin (3), (+)-epiaschantin (4), (+)-epieudesmin (5), praderin (6), 5′-methoxyyatein (7), podorhizol (8), deoxypodorhizone (9), bursehernin (10), kusunokinol (11), clusin (12), and (-)-maculatin (13). The oxidative cyclization (with VOF3) of lignans 8, 9, and 10 resulted in a new and unusual benzopyran (14), isostegane (15), and a new dibenzocyclooctadiene lactone (16), respectively. The structure and relative stereochemistry of hernanol (1) and lignans 3, 7, 8, 9, 10, 11, and 12 were determined by 1D and 2DNMR and HRMS analyses. The structures and absolute stereochemistry of structures 2, 4, 5, 6, 13, 14, 15, and 16 were unequivocally determined by single-crystal X-ray diffraction analyses. Evaluation against the murine P388 lymphocytic leukemia cell line and human tumor cell lines showed podophyllotoxin derivatives 2 and 3 to be strong cancer cell line growth inhibitors and substances 4, 5, 8, and 15 to have marginal cancer cell line inhibitory activities. Seven of the lignans and one of the synthetic modifications (14) inhibited growth of the pathogenic bacterium Neisseria gonorrhoeae.
TRIP-Catalyzed Asymmetric Synthesis of (+)-Yatein, (-)-α-Conidendrin, (+)-Isostegane, and (+)-Neoisostegane
Hartmann, Peter,Lazzarotto, Mattia,Steiner, Lorenz,Cigan, Emmanuel,Poschenrieder, Silvan,Sagmeister, Peter,Fuchs, Michael
, p. 5831 - 5837 (2019/04/25)
The asymmetric allylation under the assistance of catalytic amounts of 3,3′-bis(2,4,6-triisopropylphenyl)-1,1′-binaphthyl-2,2′-diyl hydrogen phosphate (TRIP) allows the concise construction of the lignan scaffold from simple aldehydes and allylic bromides with full control of the two formed stereocenters. This young methodology has been employed to synthesize four naturally and pharmaceutically active lignans. Members of the dibenzylbutyrolactone, the tetraline, and the dibenzocyclooctadiene classes have been synthesized in 40-47% overall yield along four-step synthetic routes.
PROCESS TO OBTAIN SYNTHETIC AND SEMI-SYNTHETIC LIGNAN DERIVATIVES, THEIR ANTIPARASITIC ACTIVITIES AND CORRESPONDING PHARMACEUTICAL FORMULATIONS, INCLUDING THE THERAPEUTIC METHOD USING SAID LIGNAN FOR THE TREATMENT OF PARASITOSIS
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Page/Page column 6; 11, (2010/11/25)
The invention refers to a process to obtain synthetic and semi-synthetic derivatives of lignans, especially dibenzylbutyrolactonic, tetrahydrofuranic, aryltetralynic, furofuranic and dibenzocyclooctanic lignans obtained by means of partial synthesis and/o
A general approach to the asymmetric synthesis of lignans: (-)-methyl piperitol, (-)-sesamin, (-)-aschantin, (+)-yatein, (+)-dihydroclusin, (+)-burseran, and (-)-isostegane
Enders, Dieter,Lausberg, Vivien,Del Signore, Giuseppe,Berner, Otto Mathias
, p. 515 - 522 (2007/10/03)
A highly efficient, diastereo- and enantioselective route was developed to access a great variety of lignans. The asymmetric synthesis of the 2,3-disubstituted γ-butyrolactones 9a-c could be improved in the case of aldol reactions by employing 2.2 equivalents of LiCl as an additive to provide, after purification, highly diastereo- and enantioenriched starting materials for the synthesis of the furofuran lignans (-)-methyl piperitol, (-)-sesamin, and (-)-aschantin. Furthermore, the γ-butyrolactone 15 was converted into dibenzylbutyrolactone lignan (+)-yatein, the dibenzylbutandiol type (+)-dihydroclusin, the tetrahydrofuran type (+)-burseran, and the dibenzocyclooctadiene type (-)-isostegane.
Synthesis of non-phenolic bisbenzocyclooctadiene lignan lactones and aporphinic alkaloids, by oxidative coupling with new agents in fluoro acid medium. IV
Planchenault,Dhal,Robin
, p. 5823 - 5830 (2007/10/02)
A systematic study of oxidants used in fluoro acid medium allowed us to increase notably the number of efficient reagents for the non-phenolic oxidative coupling of lignan and alkaloid precursors. If dibenzylbutanolide had no methylenedioxyle group, Re2O7 and RuO2.2H2O were the most efficient. With a methylenedioxyle group, best results were obtained with Tl2O3, Mn(OAc)3.2H2O and Ce(OH)4. Finally, aporphines were obtained with good yields with Ce(OH)4, RuO2.2H2O and Fe(OH)(OAc)2.
Ruthenium dioxide in fluoro acid medium: I. A new agent in the biaryl oxidative coupling. Application to the synthesis of non phenolic bisbenzocyclooctadiene lignan lactones
Landais,Robin,Lebrun
, p. 3787 - 3804 (2007/10/02)
Ruthenium (IV) dioxide dihydrate in fluoro acid medium was found to be a very efficient agent for the oxidative coupling of non phenolic lignans and their derivatives, and this method was applied to the total synthesis of (+/-)-neoisostegane 2a and (+/-)-steganolide A 2b. This procedure was also used to obtain the first stereospecific synthesis of a cis-bisbenzocyclooctadiene lactone, the (+/-)-deoxyschizandrin 17, of which, was afforded by a short reduction sequence.
