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Volumn , Issue 15, 2007, Pages 2425-2429

Synthesis of phenol abietane diterpenes based on the oxidative radical cyclization utilizing the Mn(OAc)3/Ac2O system

Author keywords

Abietane diterpenoids; Enantiospecific synthesis; Phenols

Indexed keywords

19 HYDROXYFERRUGINOL; ABIETANE DERIVATIVE; ACETIC ANHYDRIDE; ACETYLSALICYLIC ACID; BETA OXOCARBOXYLIC ACID ESTER; ESTER DERIVATIVE; IMMUNOSUPPRESSIVE AGENT; MANGANESE DERIVATIVE; PHENOL DERIVATIVE; UNCLASSIFIED DRUG;

EID: 34948815024     PISSN: 09365214     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-2007-985586     Document Type: Article
Times cited : (15)

References (44)
  • 1
    • 85007932316 scopus 로고
    • For some references on the biological activities, see: a
    • For some references on the biological activities, see: (a) Nakatani, N.; Iwatani, R. Agric. Biol. Chem. 1984, 48, 2081.
    • (1984) Agric. Biol. Chem , vol.48 , pp. 2081
    • Nakatani, N.1    Iwatani, R.2
  • 38
    • 0006072452 scopus 로고    scopus 로고
    • Pascual Teresa, J. de; San Feliciano, A.; Miguel del Corral, J. M.; Barrero, A. F. Phytochemistry 1983, 22, 300.
    • Pascual Teresa, J. de; San Feliciano, A.; Miguel del Corral, J. M.; Barrero, A. F. Phytochemistry 1983, 22, 300.
  • 40
    • 0025763819 scopus 로고    scopus 로고
    • The epoxidation of ester 18 to give compounds 19 and 20 was previously described by Barrero et al., who reported a 40% yield for this transformation. See: Barrero, A. F.; Quintana, R.; Altarejos, J. Tetrahedron 1991, 47, 4441.
    • The epoxidation of ester 18 to give compounds 19 and 20 was previously described by Barrero et al., who reported a 40% yield for this transformation. See: Barrero, A. F.; Quintana, R.; Altarejos, J. Tetrahedron 1991, 47, 4441.
  • 41
    • 0033523079 scopus 로고    scopus 로고
    • Aldehyde 16 was obtained by the same procedure from the mixture of 12R,13S- and 12S, 13R-epoxy derivatives, resulting from the epoxidation of methyl cis-communate. See: Barrero, A. F.; Sánchez, J. F.; Elmerabet, J.; Jimenez-Gonzalez, D.; Macías, F. A.; Simonet, A. M. Tetrahedron 1999, 55, 7289.
    • Aldehyde 16 was obtained by the same procedure from the mixture of 12R,13S- and 12S, 13R-epoxy derivatives, resulting from the epoxidation of methyl cis-communate. See: Barrero, A. F.; Sánchez, J. F.; Elmerabet, J.; Jimenez-Gonzalez, D.; Macías, F. A.; Simonet, A. M. Tetrahedron 1999, 55, 7289.
  • 43
    • 34948833372 scopus 로고    scopus 로고
    • Typical Procedure for Radical Cyclization Strictly deoxygenated Ac2O (20 mL) was added to a mixture of manganese(III) acetate dihydrate (3.21 g, 12 mmol) and LiCl (365 mg, 8.6 mmol) under argon atmosphere, and the resulting suspension was stirred at r.t. for 15 min. Then, a solution of β-ketoester( 15, 1 g, 2.86 mmol) in deoxygenated Ac2O (20 mL) was added, and the mixture was stirred at reflux for 9 h, at which time TLC showed no starting material. The reaction mixture was cooled to 0°C, and then quenched with H2O (10 mL, After stirring for 10 min, t-BuOMe (120 mL) was added and the reaction mixture was stirred for an additional 10 min. The mixture was washed with H2O (10 x 30 mL) and brine (3 x 20 mL, The dried organic layer was evaporated and the residue was directly purified by flash chromatography (hexane-t-BuOMe, 7:3) to yield 22 0.82 g, 74, as a yellow syrup
    • 2O (10 x 30 mL) and brine (3 x 20 mL). The dried organic layer was evaporated and the residue was directly purified by flash chromatography (hexane-t-BuOMe, 7:3) to yield 22 (0.82 g, 74%) as a yellow syrup.
  • 44
    • 34948815814 scopus 로고    scopus 로고
    • Spectroscopic properties of natural terpenoids (10 and 11) were identical to those reported in the literature. All new compounds were fully characterized spectroscopically and had satisfactory high-resolution mass spectroscopy data.
    • Spectroscopic properties of natural terpenoids (10 and 11) were identical to those reported in the literature. All new compounds were fully characterized spectroscopically and had satisfactory high-resolution mass spectroscopy data.


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