Convenient general preparation of oxygenated monofluoro- and gem-difluoro-5a-androstanes using diethylaminosulphur trifluoride
作者:T. Geoffrey C. Bird、Peter M. Fredericks、Ewart R. H. Jones、G. Denis Meakins
DOI:10.1039/c39790000065
日期:——
Hydroxy-ketones in the 5α-androstane series are converted into fluoro-ketones by diethylaminosulphurtrifluoride under mild conditions; acetoxy-ketones give acetoxydifluorides under more vigorous conditions.
Conversion of the carbonyl group to CF2 using iodine monofluoride (IF)
作者:Shlomo Rozen、Dov Zamir
DOI:10.1021/jo00015a024
日期:1991.7
A novel method for the transformation of CO --> CF2 is described. The easily made hydrazone derivatives of the carbonyl moiety are reacted under mild conditions with IF prepared directly from the corresponding elements. Various hydrazones have been examined and compared with each other. Unsubstituted ones are usually the most suitable although they are not always easy to purify and store. N-Methyl- and N,N-dimethylhydrazones also give quite satisfactory results. The more easily made dinitrophenyl hydrazones (DNPs), semicarbazones, and tosylhydrazones also react, but the yields of the desired CF2 compounds are usually lower. Oximes could also be successfully reacted. The two main byproducts of the reaction are the parent carbonyl compounds, which can be recycled, and the alpha-iododifluoro derivatives. The latter upon treatment with LiAlH4 or Bu3SnH were reduced to the desired product, thus increasing the overall yields.
The Reaction of Sulfur Tetrafluoride with Steroids<sup>1</sup>
作者:David G. Martin、Fred Kagan
DOI:10.1021/jo01056a044
日期:1962.9
Synthesis of high-affinity fluorine-substituted ligands for the androgen receptor. Potential agents for imaging prostatic cancer by positron emission tomography
作者:Aijun Liu、Kathryn E. Carlson、John A. Katzenellenbogen
DOI:10.1021/jm00089a024
日期:1992.5
for AR. Derivatives of the natural androgens (T and DHT) as well as MNT have little affinity for other steroid hormone receptors (progesterone and mineralocorticoid receptors), whereas the Mib and R1881 derivatives have somewhat greater heterologous binding. With sex steroid binding protein, a human serum binding protein, the pattern of binding affinities is nearly the reverse, with derivatives of Mib