Zobrazeno 1 - 10
of 43
pro vyhledávání: '"Taichiro Komeno"'
Publikováno v:
Chemical and Pharmaceutical Bulletin. 25:1306-1311
Some estrone and epiandrosterone derivatives having a sulfur function at C16 were prepared by substitution reaction of 16α- and 16β-bromo-17-ketosteroids with sulfur nucleophiles. The reaction proceeds with inversion at C16. Equilibration experimen
Publikováno v:
Japanese Journal of Pharmacology. 43:9-16
Publikováno v:
Tetrahedron Letters. 15:1157-1160
Publikováno v:
Journal of Labelled Compounds and Radiopharmaceuticals. 19:981-990
Latamoxef (I) was labelled with 14C for metabolic and pharmacological studies. The carbon-14 label was introduced into the C-1 position and the C-2 position of the amido side chain to prepare (II) and (III) in overall yields of 10.6 and 13.5% based o
Publikováno v:
Japanese Journal of Pharmacology. 35:330-333
Publikováno v:
Tetrahedron Letters. 16:135-138
Autor:
D.A. Lightner, K. Kuriyama, David A. Schooley, Ken'ichi Takeda, Taichiro Komeno, Carl Djerassi
Publikováno v:
Tetrahedron. 24:6913-6933
Optical rotatory dispersion and circular dichroism measurements of a number of steroidal thiocyanates have demonstrated that a low intensity absorption near 250 nm is optically active. On the assumption that this transition of thiocyanates is qualita
Publikováno v:
Chemical and Pharmaceutical Bulletin. 17:2586-2598
Extension on the cyclization reaction of a steroidal 6α-acetylthio-4-en-3-one by treatment of sodium hydride, giving a methyl thiophene fused at C4, C5, and C6, was studied. Similar cyclization of 6α-acetoxy-and 6α-acetylamino-4-en-3-one, yielding
Publikováno v:
Chemical and Pharmaceutical Bulletin. 19:2116-2125
8, 9-Seco-5α-androstane-8, 9, 11-trione derivatives (III) were cyclized with Al2O3 or SiO2 in CH2Cl2 or CH3CN affording the diketo-ols (IV and V) and their dehydrated products, ene-diones (VI and VII). Introduction of substituents into the 3- and 17
Publikováno v:
The Journal of Organic Chemistry. 29:1136-1141