340181-93-3Relevant academic research and scientific papers
Concise, scalable and enantioselective total synthesis of prostaglandins
Zhang, Fuhao,Zeng, Jingwen,Gao, Mohan,Wang, Linzhou,Chen, Gen-Qiang,Lu, Yixin,Zhang, Xumu
, p. 692 - 697 (2021/06/01)
Prostaglandins are among the most important natural isolates owing to their broad range of bioactivities and unique structures. However, current methods for the synthesis of prostaglandins suffer from low yields and lengthy steps. Here, we report a practicability-oriented synthetic strategy for the enantioselective and divergent synthesis of prostaglandins. In this approach, the multiply substituted five-membered rings in prostaglandins were constructed via the key enyne cycloisomerization with excellent selectivity (>20:1 d.r., 98% e.e.). The crucial chiral centre on the scaffold of the prostaglandins was installed using the asymmetric hydrogenation method (up to 98% yield and 98% e.e.). From our versatile common intermediates, a series of prostaglandins and related drugs could be produced in two steps, and fluprostenol could be prepared on a 20-gram scale. [Figure not available: see fulltext.]
A unified strategy to prostaglandins: chemoenzymatic total synthesis of cloprostenol, bimatoprost, PGF2α, fluprostenol, and travoprost guided by biocatalytic retrosynthesis
Chen, Fener,Huang, Zedu,Jiang, Meifen,Li, Weijian,Tang, Pei,Ye, Baijun,Zhang, Guo-Tai,Zhu, Kejie
, p. 10362 - 10370 (2021/08/16)
Development of efficient and stereoselective synthesis of prostaglandins (PGs) is of utmost importance, owing to their valuable medicinal applications and unique chemical structures. We report here a unified synthesis of PGs cloprostenol, bimatoprost, PGF2α, fluprostenol, and travoprost from the readily available dichloro-containing bicyclic ketone6aguided by biocatalytic retrosynthesis, in 11-12 steps with 3.8-8.4% overall yields. An unprecedented Baeyer-Villiger monooxygenase (BVMO)-catalyzed stereoselective oxidation of6a(99% ee), and a ketoreductase (KRED)-catalyzed diastereoselective reduction of enones12(87?:?13 to 99?:?1 dr) were utilized in combination for the first time to set the critical stereochemical configurations under mild conditions. Another key transformation was the copper(ii)-catalyzed regioselectivep-phenylbenzoylation of the secondary alcohol of diol10(9.3?:?1 rr). This study not only provides an alternative route to the highly stereoselective synthesis of PGs, but also showcases the usefulness and great potential of biocatalysis in construction of complex molecules.
Novel method for preparing Prostaglandin derivatives
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Paragraph 0133; 0136; 0166-0168, (2017/10/31)
Provided is a novel method for preparing prostaglandin derivatives. The method is suitable for mass production by effectively manufacturing prostaglandin derivatives with high yield. The method comprises the following steps: (S-1) adding a first reducing agent to a prostaglandin intermediate compound represented by chemical formula II and manufacturing a compound represented by chemical formula III; (S-2) manufacturing a compound represented by chemical formula IV from the compound represented by chemical formula III in the presence of a base; (S-3) adding a second reducing agent to the compound represented by chemical formula IV and manufacturing a compound represented by chemical formula V; and (S-4) performing Wittig reaction of the compound represented by chemical formula V and a compound represented by chemical formula VI, and manufacturing a compound represented by chemical formula I.COPYRIGHT KIPO 2017
Preparation method and application of prostaglandin analogue
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Paragraph 0049; 0050, (2016/12/12)
The invention provides a preparation method and application of a prostaglandin analogue. The method comprises the following steps: enabling a compound shown by formula 1 in the specification to contact with dichlorodicyanobenzoquinone to obtain a compound shown by formula 2 in the specification. The method has the advantages of simple and convenient steps, mild reaction conditions and high yield and high purity of target product.
Processes for the preparation of isomer free prostaglandins
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Paragraph 0106, (2015/03/03)
Novel processes for the preparation of a compound of Formula I-2 substantially free of the 5,6-trans isomer: wherein R2, R3 and R4 are as defined in the specification are provided. Novel intermediates for the preparations of isomer free Prostaglandins and derivatives thereof are also provided.
PROCESSES AND INTERMEDIATES FOR THE PREPARATIONS OF ISOMER FREE PROSTAGLANDINS
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Paragraph 0107, (2015/02/25)
Novel processes for the preparation of a compound of Formula I-2 substantially free of the 5,6-trans isomer: wherein R2, R3 and R4 are as defined in the specification are provided. Novel intermediates for the preparations of isomer free Prostaglandins and derivatives thereof are also provided.
PROCESS FOR THE PREPARATION OF TRAVOPROST
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Page/Page column 9, (2014/06/23)
The subject of the invention is process the preparation of travoprost of formula (I) characterized by that the free acid of formula (II) is a. ) activated with 2-chloro-l,3-dimethylimidazolinium chloride (DMC) and the resulting activated carboxylic acid intermediate is reacted with isopropyl alcohol, or b. ) reacted with alkyl haloformate and the resulting mixed anhydride is reacted with isopropyl alcohol, or c. ) activated with a straight or branched C1-8 dialkyl dicarbonate and reacted with isopropanol in the presence of water-free magnesium salt.
PROCESS FOR THE PREPARATION OF TRAVOPROST
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Paragraph 0074-0078, (2014/12/09)
The invention relates to a process for the preparation of travoprost of formula (I), comprising that, the compound of formula (II), is stereo selectively reduced, the resulting compound of formula (III), is if desired crystallized, the lactone group of th
A novel convergent synthesis of the potent antiglaucoma agent travoprost
Dams, Iwona,Chodyński, Micha?,Krupa, Ma?gorzata,Pietraszek, Anita,Zezula, Marta,Cmoch, Piotr,Kosińska, Monika,Kutner, Andrzej
, p. 1634 - 1648 (2013/02/26)
The 16-(3-trifluoromethyl)phenoxy PGF2α analogue travoprost (8a) has potent topical ocular activity. A novel convergent synthesis of 13,14-en-15-ol PGF2α analogues was developed employing Julia-Lythgoe olefination of the structurally advanced prostaglandin phenylsulfone (5Z)-(+)-15 with a new enantiomerically pure aldehyde ω-chain synthon (S)-(-)-16a. Subsequent hydrolysis of protecting groups and final esterification of fluprostenol (7a) yielded travoprost (8a). The main advantages are the preparation of high purity travoprost (8a) and the application of comparatively cheap reagents. The novel convergent strategy allows the synthesis of a whole series of 13,14-en-15-ol PGF2α analogues from a common and structurally advanced prostaglandin intermediate 15. The preparation and identification of two synthetic impurities, 15-epi isomer (8b) of travoprost and a new prostaglandin related ester (5Z)-(+)-18, are also described.
PROCESS FOR PREPARATION OF PROSTAGLANDIN F2α ANALOGUES
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Page/Page column 48; 49, (2013/09/26)
A convergent synthesis of the prostaglandin F2α analogues, travoprost and bimatoprost, was developed employing Julia-Lythgoe olefination of the structurally advanced phenylsulfone with an enantiomerically pure aldehyde ω-chain synthon. The novel convergent strategy allows the synthesis of a whole series of prostaglandin analogues of high purity from a common and structurally advanced prostaglandin intermediate.
