Selective thioketalization process, process for preparing thioenol ethers from thioketals, and process for the preparation of thioketals
摘要:
一种选择性硫醚化过程,用于从二酮制备硫醚,其中二酮的一个但不是另一个酮基是α,β-不饱和的,选择性硫醚化发生在不是α,β-不饱和的酮基上,包括将二酮与硫醇接触,在存在Lewis酸和质子源的复合物的质子酸催化剂的情况下,反应介质的温度在反应过程中保持在大约25°C以下。最好,进一步,(i) 过量使用酸催化剂和/或 (ii) 过量使用硫醇。该创新过程可以用于从相应的3,17-二酮雄烯制备3-酮,17-硫醚雄烯。一种从硫醚制备硫烯醚的过程,特别是从3-酮,17-硫醚雄烯制备3-酮,17-硫烯醚雄烯的过程,其中硫醚与质子酸催化剂接触。一种从硫烯醚制备硫醚的过程,特别是从硫烯醚制备混合硫醚,例如混合的3-酮,17-硫醚雄烯,包括将硫烯醚与硫醇在质子酸催化剂的存在下接触的步骤。
3-Ketoandrostenes having in the 17-position the substituents R.sub.1 --S-- and R.sub.2 --S-- wherein R.sub.1 and R.sub.2 are the same or different and each is alkyl, cycloalkyl or aryl, have antiinflammatory activity.
17,17-Bis(substituted thio)-3-ketoandrostenes and pharmaceutical compositions
申请人:E.R. Squibb & Sons, Inc.
公开号:EP0073026A1
公开(公告)日:1983-03-02
Described are 3-Ketoandrostenes having in the 17- position the substituents R,-S- and R2-S- wherein R, and R2 are the same or different and each is alkyl, cycloalkyl or aryl, which have antiinflammatory activity.
A steroid ointment formulation which has enhanced physical and chemical stability is formed of (11β,17α)-17-(ethylthio)-9α-fluoro-11β-hydroxy-17-(methylthio)androsta-1,4-dien-3-one (tipredane), and a vehicle containing as major ingredients propylene glycol and water, cetearyl alcohol and ceteareth 20 or other dispersing agent for propylene glycol, together with a sodium or potassium citrate and mag esium hydroxide buffer to impart a neutral or slightly alkaline apparent pH (5 to 9), a non-acidic long chain fatty acid wax to impart proper consistency to the ointment and sodium metabisulfite and butylated hydroxy toluene as antioxidants, together with thickeners, emollients, lubricants and other conventional ointment formulation ingredients.