Convergent Synthesis of Vitamin D3 Metabolites. Control of the Stereoselectivity in Samarium-Induced Cyclopropanations of Cyclopentenes
摘要:
The 25-hydroxy and 1 alpha,25-dihydroxy vitamin D-3 metabolites are obtained by solvolytic rearrangements of the 1-desoxy and 1 alpha-hydroxy cyclopropyl vinylogous alcohols 31 and 29, respectively, with simultaneous formation of the vitamin D structural triene and the 3-hydroxy function. Two complementary methods have been employed to direct the stereoselectivity ofthe samarium induced olefin cyclopropanations which ultimately lead to key chiral ring A precursors. One protocol uses the two stereogenic centers of the (R,R)-B,S-butanediol ketal moiety of 8, while the other method uses the allylic hydroxyl group of(R)-16.
[EN] 1 -(CYCLOPENT-2-EN-1 -YL)-3-(2-HYDROXY-3-(ARYLSULFONYL)PHENYL)UREA DERIVATIVES AS CXCR2 INHIBITORS<br/>[FR] DÉRIVÉS DE 1-(CYCLOPENT-2-EN-1-YL)-3-(2-HYDROXY-3-(ARYLSULFONYL)PHÉNYL)-URÉE UTILISÉS COMME INHIBITEURS DE CXCR2
申请人:GLAXOSMITHKLINE IP DEV LTD
公开号:WO2015181186A1
公开(公告)日:2015-12-03
The invention relates to 1-(3-sulfonylphenyl)-3-(cyclopent-2-en-1-yl)urea derivatives, and their use in treating or preventing diseases and conditions mediated by the CXCR2 receptor. In addition, the invention relates to compositions containing the derivatives and processes for their preparation.
Discovery of Novel 1-Cyclopentenyl-3-phenylureas as Selective, Brain Penetrant, and Orally Bioavailable CXCR2 Antagonists
作者:Hongfu Lu、Ting Yang、Zhongmiao Xu、Xichen Lin、Qian Ding、Yueting Zhang、Xin Cai、Kelly Dong、Sophie Gong、Wei Zhang、Metul Patel、Royston C. B. Copley、Jianing Xiang、Xiaoming Guan、Paul Wren、Feng Ren
DOI:10.1021/acs.jmedchem.7b01854
日期:2018.3.22
pharmacology with excellent selectivity over CXCR1 and other chemokine receptors. Rat and dog pharmacokinetics (PK) revealed good oral bioavailability, high oral exposure, and desirable elimination half-life of the compound in both species. In addition, the compound demonstrated dose-dependent efficacy in the in vivo pharmacology neutrophil infiltration “air pouch” model in rodents after oral administration. Further
Gold(III) Bromide Catalyzed Furannulation of 2-Alkynylcycloalk-2-enols: An Expedient Route to Fused Furans
作者:P. Perumal、C. Praveen、P. Kiruthiga
DOI:10.1055/s-0029-1217517
日期:2009.7
An efficient synthesis of fused furans from 2-alkynylcycloalk-2-enols via gold(III) bromide catalyzed cycloisomerization was achieved. The reaction condition is moderate and amenable to structurally diverse substrates, leading to good yield of products.
Rhodium-Catalyzed [4+3] Cycloaddition to Furans: Direct Access to Functionalized Bicyclo[5.3.0]decane Derivatives
作者:Tanja Krainz、Sharon Chow、Natasa Korica、Paul V. Bernhardt、Glen M. Boyle、Peter G. Parsons、Huw M. L. Davies、Craig M. Williams
DOI:10.1002/ejoc.201501271
日期:2016.1
An efficient method to directly access the bicyclo[5.3.0]decane core was achieved by rhodium-catalyzed reaction of a novel donor-acceptor cyclopentenyl diazocarboxylate with a variety of furans. As this motif is commonly found within bioactive antitumor natural products, selected systems were further manipulated and evaluated against cancer cell lines sensitive to protein kinase C (PKC) activation
通过新型供体-受体环戊烯基重氮羧酸酯与多种呋喃的铑催化反应,实现了直接进入双环[5.3.0]癸烷核心的有效方法。由于该基序通常存在于生物活性抗肿瘤天然产物中,因此针对对蛋白激酶 C (PKC) 激活敏感的癌细胞系,对选定的系统进行了进一步操作和评估。首次合成了一种环状供体 - 受体重氮化合物,有助于直接访问双环 [5.3.0] 癸烷基序,这在许多具有抗癌活性的突出天然产物中很常见。针对各种 PKC 癌细胞系评估了一些示例。
Extrapolation of the gold-catalyzed cycloisomerization to the palladium-catalyzed cross-coupling/cycloisomerization of acetylenic alcohols for the synthesis of polysubstituted furans: Scope and application to tandem processes
作者:Chandrasekar Praveen、Paramasivan T. Perumal
DOI:10.1016/s1872-2067(15)60994-9
日期:2016.2
of diverse furan derivatives from acetylenic alcohols by gold and palladium catalyzed π-activation chemistry. Notably, this new method was found to be amenable to cyclooctyl-containing substrates, which represents a significant extension to this methodology compared with our previous reports. Furthermore, this newly developed method allowed for the direct construction of cyclooctyl furans from their