ELABORATION OF THE CARBON SKELETON OF QUASSINOIDS: SYNTHESIS OF (1BETA , 9BETA )-1-HYDROXYPICRAS-12-EN-16-ONEGRIECO PA; VIDARI G; FERRINO S et al.1980; TETRAHEDRON LETTERS; GBR; DA. 1980; VOL. 21; NO 17; PP. 1619-1622; BIBL. 14 REF.Article

A partial synthesis of picrasin B and #7B-Oe²-picrasin B¹KAWADA, K; KIM, M; WATT, D. S et al.Tetrahedron letters. 1989, Vol 30, Num 44, pp 5985-5988, issn 0040-4039Article

TOTAL SYNTHESIS OF DL-QUASSINGRIECO PA; FERRINO S; VIDARI G et al.1980; J. AM. CHEM. SOC.; ISSN 0002-7863; USA; DA. 1980; VOL. 102; NO 25; PP. 7586-7587; BIBL. 14 REF.Article

AN INTRAMOLECULAR DIELS-ALDER APPROACH TO QUASSINOIDS - A STEREOSELECTIVE CONSTRUCTION OF A-AROMATIC KLAINEANONEFUKUMOTO K; CHIHIRO M; SHIRATORI Y et al.1982; TETRAHEDRON LETT.; ISSN 0040-4039; GBR; DA. 1982; VOL. 23; NO 29; PP. 2973-2976; BIBL. 14 REF.Article

STEROIDE UND SEXUALHORMONE. CCLXI: QUASSINOIDE BITTERSTOFFE. 2: PARTIALSYNTHETISCHER ZUGANG ZU QUASSIN: UEBERFUEHRUNG VON TESTOSTERON IN EINE SCHLUESSELVERBINDUNG MIT ANGULAERER 8BETA -METHYLGRUPPE = STEROIDES ET HORMONES SEXUELLES. CCLXI: SUBSTANCES AMERES QUASSINOIDES. 2: SYNTHESE PARTIELLE DE LA QUASSINE: SYNTHESE D'UN INTERMEDIAIRE CLE AVEC UN GROUPE METHYLE ANGULAIRE 8BETA A PARTIR DE LA TESTOSTERONEPFENNINGER J; GRAF W.1980; HELV. CHIM. ACTA; ISSN 0018-019X; CHE; DA. 1980; VOL. 63; NO 6; PP. 1562-1580; ABS. ENG; BIBL. 23 REF.Article

Biologically active quassinoids: synthetic methodology for the conversion of chaparrin into glaucarubolone esters and quassinoid analogsBHATNAGAR, S. C; CARUSO, A. J; POLONSKY, J et al.Tetrahedron (Oxford. Print). 1987, Vol 43, Num 15, pp 3471-3480, issn 0040-4020Article

An enantioselective total synthesis of (+)-picrasin B¹KAWADA, K; KIM, M; WATT, D. S et al.Tetrahedron letters. 1989, Vol 30, Num 44, pp 5989-5992, issn 0040-4039Article

On the reduction of quassinCECCHERELLI, P; CURINI, M; DIAMANTINI, M et al.Tetrahedron (Oxford. Print). 1987, Vol 43, Num 1, pp 243-247, issn 0040-4020Article

16BETA -ALKOXY-17AALPHA -HYDROXY-D-HOMO-17-OXAPREGNAN-20-ONES: PREPARATION, CHEMISTRY, AND X-RAY CRYSTALLOGRAPHIC ANALYSISCIMARUSTI CM; GRABOWICH PG; TOEPLITZ BK et al.1981; J. ORG. CHEM.; ISSN 0022-3263; USA; DA. 1981; VOL. 46; NO 4; PP. 803-806; BIBL. 11 REF.Article

Reactions of phenanthrene-9,10-quinone with benzoyl- and acetylmethylene-triphenylphosphoranes. trapping of the o-quinone methanide intermediatesNICOLAIDES, D. N; LEFKADITIS, D. A; LIANIS, P. S et al.Journal of the Chemical Society. Perkin transactions. I. 1989, Num 12, pp 2329-2333, issn 0300-922XArticle

Use of an axial α-face control element in intramolecular conjugate additions: synthesis of an ABCD tetracyclic bruceantin precursorSURYAWANSHI, S. N; FUCHS, P. L.Journal of organic chemistry. 1986, Vol 51, Num 6, pp 902-921, issn 0022-3263Article

A free-radical cyclization of α-bromo acetals leading to tetracyclic 9β-picrasanesMOONSUN KIM; GROSS, R. S; SEVESTRE, H et al.Journal of organic chemistry. 1988, Vol 53, Num 1, pp 93-98, issn 0022-3263Article

An alternate route to a quassin synthon. Comparison of 1,3-diaxial and peri steric interferences in hydride reductionsSCHMIDT, C; BREINING, T.Tetrahedron (Oxford. Print). 1983, Vol 39, Num 23, pp 3929-3935, issn 0040-4020Article

A new route to quassin basic skeleton via allenecarboxylate intramolecular cycloadditionYOSHIDA, M; KANEMATSU, K.Heterocycles (Sendai). 1987, Vol 26, Num 12, pp 3093-3096, issn 0385-5414Article

Studien auf dem Gebiet der Naturstoffchemie. VC: Synthese des 4,5α-Epoxy-17,6',6'-trimethyl-6'H-morphin-7-eno[3,2-b]pyran 6β-ols via PTC-Reaktion = Etudes dans le domaine des composés naturels. VC: Synthèse de l'époxy-4,5α triméthyl-17,6',6' 6'H-morphinéno-7 [3,2-b] pyrannol-6β via une réaction avec catalyse par transfert de phase = Studies in the field of natural products. VC: Synthesis of the 4,5α-epoxy-17,6',6'-trimethyl-6'H-morphin-7-eno [3,2-b] pyran-6β-ol via PTC reactionREISCH, J; DHARMARATNE, H. R. W.Archiv der Pharmazie (Weinheim). 1985, Vol 318, Num 4, pp 382-384, issn 0365-6233Article