专利号:US-4267106-A 优先权日:1978-08-15 标 题:New process for the preparation 17β-hydroxy-3-oxo-17α-pregnene and pregnadiene-21-carboxylic acid γ-lactones 发明人:MARX ARTHUR F; SMID PETER M; VELLEKOOP PIETER 权利人:GIST BROCADES NV 摘要:A process is disclosed for the preparation of 17β-hydroxy-3-oxo-l7α-pregn-4-ene-21-carboxylic acid γ-lactone and 17β-hydroxy-3-oxo-17α-pregna-4,6-diene-21-carboxylic acid γ-lactone of the formula: ##STR1## wherein the dotted line between the 6-7 positions indicates an optional double bond, which is present in the latter compound, by reacting an androst-5-ene-17-one derivative with an organo-phosphorus compound. These lactones are valuable intermediates in the synthesis of spironolactone.
专利号:US-11220474-B2 优先权日:2018-08-20 标题:Method for synthesising vitamin A 发明人:REY PATRICK; HUET ROBERT; AUBRY SYLVAIN; HENRYON VIVIEN 权利人:ADISSEO FRANCE SAS 摘要:A method for preparing dehydro-cyclofarnesal from dehydro-farnesal by cyclization in the presence of an acid may include the dehydro-farnesal being obtained from the farnesal by dehydrogenation and may further includes the cyclization being carried out in the presence of an acid selected from Lewis acids, Bronstedt acids, and zeolites. The synthesis of vitamin A using this method further includes the conversion of dehydro-cyclofarnesal into vitamin A.
专利号:GB-2028825-A 优先权日:1978-08-15 标题:Novel Synthesis of Steroid 17- Spirolactone Ring
专利号:JP-2011178789-A 优先权日:1999-11-18 标 题:Metathesis synthesis method of pheromone or its components
专利号:CN-112409432-A 优先权日:2020-11-16 标题 :Synthesis method of exemestane
专利号:CN-109956696-B 优先权日:2019-03-05 标 题:Synthesis method of side chain adsorption type concrete superplasticizer
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