5982-99-0Relevant articles and documents
Method for synthesizing stanozolol intermediate androstane-17alpha-methyl-17beta-hydroxyl-3-ketone
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, (2019/04/09)
The invention provides a method for synthesizing a stanozolol intermediate androstane-17alpha-methyl-17beta-hydroxyl-3-ketone. The method comprises the following steps: taking 4-androstenedione as a raw material, carrying out 3-site and 17-site keto-double-ketal, 5-site ethylenic bond catalytic hydrogenation and 3-site and 17-site double-ketal hydrolysis to prepare a compound 5alpha-androstane-3,17-diketone; then carrying out 3-site keto-double-etherification and 17-site Grignard addition, and finally carrying out hydrolysis to prepare the compound androstane-17alpha-methyl-17beta-hydroxyl-3-ketone, wherein the HPLC (High Performance Liquid Chromatography) purity of the compound is 99.0% or greater. The method provided by the invention is short in route, easy in production process control,environmentally-friendly, low in production cost and applicable to industrial large-scale production.
Highly efficient chemoselective deprotection of O,O-acetals and O,O-ketals catalyzed by molecular iodine in acetone
Sun, Jianwei,Dong, Yanmei,Cao, Liya,Wang, Xinyan,Wang, Shaozhong,Hu, Yuefei
, p. 8932 - 8934 (2007/10/03)
An extremely convenient method for deprotection of acetals and ketals catalyzed by molecular iodine (10 mol %) in acetone is reported. The protocol achieved the deprotection of acyclic or cyclic O,O-acetals and O,O-ketals in excellent yields within a few minutes under neutral conditions. The double bond, hydroxyl group, and acetate group remained unchanged, and the highly acid-sensitive furyl, tert-butyl ethers, and ketone-oxime stayed intact under these conditions.
CHEMOSELECTIVITY IN MOLYBDENUM CATALYZED ALCOHOL AND ALDEHYDE OXIDATIONS
Trost, Barry M.,Masuyama, Yoshiro
, p. 173 - 176 (2007/10/02)
Hydrogen peroxide in the presence of (NH4)6Mo7O24*4H2O and potassium carbonate is a chemoselective method to oxidize secondary alcohols to ketones and to oxidize aldehydes to acids, the latter also accelerated by cerium chloride.