64-82-4Relevant articles and documents
ANTI-CANCER NUCLEAR HORMONE RECEPTOR-TARGETING COMPOUNDS
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Page/Page column 147-149, (2021/05/21)
The disclosure relates to anti-cancer compounds which are anti-cancer PARP inhibitors of formula Al, A2, A3 or A4 conjugated by a linker to a steroid, whereby the steroid targets the conjugate to the nucleus, as well as to methods for their preparation and use. (I)
An efficient synthesis of 5α-androst-1-ene-3,17-dione
Zhang, Huyue,Qiu, Zhuibai
, p. 1088 - 1090 (2007/10/03)
5α-Androst-1-ene-3,17-dione (5) as a prodrug of 1-testosterone (4) was prepared in four steps from 17β-Acetoxy-5α-androstan-3-one (stanolone acetate) (1) in high yield. Thus, stanolone acetate (1) was brominated in the presence of hydrogen chloride in acetic acid to give 17β-acetoxy-2-bromo-5α-androstan-3-one (2), which underwent dehydrobromination using lithium carbonate as base with lithium bromide as an additive to give 17β-acetoxy-5α-androst-1-en-3-one (3) in almost quantitative yield with 97% of purity. Compound (3) was hydrolyzed with sodium hydroxide to give 17β-hydroxy-5α-androst-1-en-3-one (4,1-testosterone), which was oxidized with chromium trioxide to afford 5α-androst-1-ene-3,17-dione (5). The overall yield of 5 was 78.2% with purity of 99%. In this method, the formation of 4-ene was diminished when 1-ene was introduced, and its mechanism was also discussed.
α-FLUORINATION OF KETONES BY XENON AND IODOBENZENE DIFLUORIDES: A STEREOCHEMICAL EVIDENCE DEMONSTRATING THEIR MECHANISTIC DIFFERENCES
Tsushima, Tadahiko,Kawada, Kenji,Tsuji, Teruji
, p. 1165 - 1168 (2007/10/02)
Xenon difluoride reacts smoothly with various steroid silyl enol ethers in the absence of any acid catalyst to afford stereoselectively α-oriented α-fluoroketones in good yields while iodotoluene difluoride reacts rather sluggishly with these silyl enol ethers to competitively produce β-oriented α-fluoro ketones, elimination and other nucleophilic substitution products.The observed stereochemical contrast clearly suggest an electrophilic and nucleophilic mechanism for these reactions, respectively.