- Recycling method of positional isomer in preparation of 3beta-acetoxy-5alpha-chloro-6beta-hydroxyandrost-17-one
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The invention discloses a recycling method for forming 3beta-acetoxyandrost-5-en-17-one by performing a cyclization elimination reaction by utilizing solid waste 3beta-acetoxy-6beta-chloro-5alpha-hydroxyandrost-17-one obtained in the process of an addition reaction of preparing 3beta-acetoxy-5alpha-chloro-6beta-hydroxyandrost-17-one from 3beta-acetyloxyandrost-5-en-17-one as a raw material, and performing a reduction elimination reaction. The method provided by the invention can effectively recover and reuse the by-product obtained in the preparation process of the 3beta-acetoxy-5alpha-chloro-6beta-hydroxyandrost-17-one, and the synthetic method is simple and convenient to operate, has mild reaction conditions, is environmentally friendly, and reduces the production costs of preparing the3beta-acetoxy-5alpha-chloro-6beta-hydroxyandrost-17-one from the 3beta-acetyloxyandrost-5-en-17-one.
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Paragraph 0034; 0035
(2019/07/16)
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- Highly stereoselective epoxidation with H2O2 catalyzed by electron-rich aminopyridine manganese catalysts
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Fast, efficient, and highly stereoselective epoxidation with H 2O2 is reached by manganese coordination complexes with e-rich aminopyridine tetradentate ligands. It is shown that the electronic properties of these catalysts vary systematically with the stereoselectivity of the O-atom transfer event and exert fine control over the activation of hydrogen peroxide, reducing the amount of carboxylic acid co-catalyst necessary for efficient operation.
- Cusso, Olaf,Garcia-Bosch, Isaac,Font, David,Ribas, Xavi,Lloret-Fillol, Julio,Costas, Miquel
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supporting information
p. 6158 - 6161
(2014/01/17)
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- The Stereochemistry of Epoxidation of Δ5-Steroids with Sodium Perborate and Potassium Permanganate
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Sodium perborate, with potassium permanganate as a catalyst, has been shown to be a novel reagent for the epoxidation of steroidal 5-enes with the attack occurring predominantly on the β-face.
- Hanson, James R.,Terry, Nicolas,Uyanik, Cavit
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- Stereoselective 7α-hydroxylation of 3β-acetoxy-Δ5-steroids by Fe(PA)3/H2O2/MeCN
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Stereoselective 7α-hydroxylation reaction of Δ5-steroids by a Fe(PA; picolinate)3/H2O2/MeCN system is presented. The 7α-hydroxylation reactions were achieved in 33-40% yields by addition of 30%-H2O2 to a solution of 3β-acetoxy-Δ5-steroids 1a-1d and a crystalline of Fe(PA)3 in MeCN.
- Kotani, Eiichi,Takeya, Tetsuya,Egawa, Hirotaka,Tobinaga, Seisho
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p. 750 - 752
(2007/10/03)
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