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Referencias:

• Alivizatos, On, (1993) Anti Cancer Drugs, 4, p. 301
• Murakoshi, Inada, Tagawa, Makino, Suzuki, Mieda, Honma, Yamanaka, (1992) Acta Pathologica Japonica, 42, p. 151
• Ichikawa, Akimoto, Shimazaki, (1993) Endocrine Journal, 40, p. 425
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• Stinson, Prostate drug Proscar cleared for marketing (1992) Chemical & Engineering News, 29, p. 7
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• Kumar, Daum, Bell, Alexander, Christiansen, Ackerman, Krolski, Wagner, (1991) Tetrahedron, 47, p. 5099
• Kumar, Bell, (1992) Heterocycles, 34, p. 1289
• Suschitzky, Scriven, (1992) Progress in Heterocyclic Chemistry, 4. , Pergamon Press
• Suschitzky, Scriven, (1993) Progress in Heterocyclic Chemistry, 5. , Pergamon Press
• Schulze, Mütze, Selke, Kempe, (1993) Tetrahedron Lett., 34, p. 1909
• Mander, Sethi, (1983) Tetrahedron Lett., 24, p. 5425
• Ziegler, Stirchak, Wester, (1986) Tetrahedron Lett., 27, p. 1229
• Childs, Weber, (1976) J. Org. Chem., 41, p. 3486
• Stang, Hanck, Subramanian, Perfluoroalkanesulfonic Esters: Methods of Preparation and Applications in Organic Chemistry (1982) Synthesis, p. 85
• Lee, Snyder, (1990) J. Org. Chem., 55, p. 4995
• McMurry, Scott, (1980) Tetrahedron Lett., 21, p. 4313
• Brückner, Scheuplein, Suffert, (1991) Tetrahedron Lett., 32, p. 1449
• Beard, Baum, Grakauskas, (1973) J. Org. Chem., 38, p. 3673. , Tetrahydrofuran must not be employed as a solvent in this reaction because it reacts with trifluoromethanesulfonic anhydride, or leads to polymerization
• Smith, Trott, (1956) C.A., 50, p. 13982. , U.S. Patent 2732398 (1956)
• A solution of 2-carboxymethyl-3-trifluoromethansulfonyloxy-5α-cholest-2-eno (IV) (1.44 g, 2.51 mmol) in ethanethiol (40 ml) was added to a suspension of sodium thioethoxide (9.74 g, 116 mmol) in ethanethiol (34.5 ml). The reaction mixture was kept at room temperature for 15 hs. After dilution with ethyl acetate, the mixture was washed with 1N NaOH and water. The dried (MgSO4) extract was evaporated and the residue was purified by flash chromatography to give pure thioenolether V (1.16 g, 95%); Cha, Kwon, (1987) J. Org. Chem., 52, p. 5486
• Mancuso, Huang, Swern, (1978) J. Org. Chem., 43, p. 2480
• Kimura, Fujita, Ando, Sonochemical activation of manganese dioxide. (1988) Chemistry Letters, p. 1387
• McKinnon, Lee, Fused heterocycles fromo-acylbenzenethiol derivatives (1988) Canadian Journal of Chemistry, 66, p. 1405
• Compound I was characterized: m.p.: 109.5–110°C (from methanol); [α]D: +61.0° (c=1.3, CHCl3); 1H-NMR (200 MHz, CDCl3) δ 0.69(3H,s,18-Me); 0.74(3H,s,19-Me); 0.87(6H,d,J=6.6 Hz, 26-Me y 27-Me); 0.92 (3H,d,J=6.4 Hz, 21-Me) ; 2.22 (1H,d,J=15.8 Hz, 1α-H); 2.44 (1H,ddd,J=17.6,11.1,2.0 Hz,4β-H); 2.78(1H,d,J=15.7 Hz,1β-H); 2.83(1H,dd,J=17.7,4.5 Hz,4α-H); 8,16(1H,s,2′-H); 13C-NMR (50 MHz, CDCl3) δ 11.6(C-19); 12.0(C-18); 18.7(C-21); 21.1(C-11); 22.5(C-26); 22.8(C-27); 23.8(C-23); 24.2(C-15); 27.8(C-4); 28.0(C-25); 28.2(C-16); 28.8(C-6); 31.6(C-7); 35.6(C-8); 35.8(C-10 y C-20); 36.2(C-22); 37.1(C-1); 39.5(C-24); 39.9(C-12); 42.4(C-13); 42.5(C-5); 53.7(C-9); 56.3(C-14 y C-17); 133.2(C-2); 157.3(C-3); 157.8(C-2′)

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