6544-68-9Relevant articles and documents
Preparation method of levonorgestrel pharmacopoeia impurity V
-
Paragraph 0010; 0018-0020; 0025-0030, (2020/12/31)
The invention belongs to the technical field of pharmacy, and particularly relates to a preparation method of a levonorgestrel pharmacopoeia impurity V. The preparation method comprises the steps of by taking a compound 1 as an initial raw material, carrying out aromatization reaction, methylation reaction and ethynylation reaction to prepare the levonorgestrel pharmacopoeia impurity V; the aromatization method comprises the steps of dissolving the compound 1 with an organic solvent, adding lithium bromide, controlling the temperature to be -5 to 5 DEG C, then adding copper bromide at the temperature, heating to room temperature, reacting and treating to obtain a compound 2. The product obtained by the method is high in purity and yield, avoids generation of impurities, and provides a qualified reference substance for quality control of levonorgestrel.
Preparative chemical methods for aromatization of 19-nor-Δ4-3-oxosteroids
Rao, Pemmaraju N.,Cessac, James W.,Kim, Hyun K.
, p. 621 - 627 (2007/10/02)
Two preparative chemical methods for aromatization of 19-nor-Δ4-3-oxosteroids are described.The first method consists of an oxidative aromatization of 19-nor-Δ4-3-oxosteroids with iodine-ceric ammonium nitrate in methanol to give a mixture of 3-methoxy ring-A aromatized derivatives consisting of the desired product, the Δ9,11 derivative, the 6-oxo derivative as well as some ring-A iodinated material.Conversion of this material to a mixture of the 3-methoxy ring-A aromatized derivative and its 6-oxo derivative was achieved by catalytic hydrogenation.Finally, reduction of the 6-oxo function with triethylsilane in trifluoroacetic acid gave the 3-methoxy-17-trifluoroacetate ring-A aromatized derivative as a single product.In the second method, reaction of 19-nor-Δ4-3-oxosteroids with copper(II) bromide in acetonitrile at room temperature resulted in aromatic steroids in a single step in excellent yields.The second method was used in the first practical chemical synthesis of a 6-dehydroestrogen from a 19-nor-Δ4,6-3-oxosteroid. - Keywords: copper(II) bromide; ceric ammonium nitrate; iodine; aromatization; 19-nor-Δ4-3-oxosteroids
TOTALLY SYNTHETIC -13-ALKYL-3-HYDROXY AND
SMITH,HUGHES,DOUGLAS,HARTLEY,MCLOUGHLIN,SIDDALL,WENDT,BUZBY Jr.,HERBST,LEDIG,MCMENAMIN,PATTISON,SUIDA,TOKOLICS,EDGREN,JANSEN,GADSBY,WATSON,PHILLIPS
, p. 394 - 396 (2007/10/12)
-