Concise synthesis of taxol a-ring components: Remote diastereoselective additions of alkenyl lithiums to aldehydes
摘要:
The acid chloride 6 provides access to 7 (R,S and S,S) which upon bromine-lithium exchange undergoes remarkably highly diastereoselective additions to aldehydes; 7 is also readily elaborated into the acetal 10. Copyright (C) 1996 Elsevier Science Ltd
作者:Yoshihiro Ishihara、Abraham Mendoza、Phil S. Baran
DOI:10.1016/j.tet.2013.04.028
日期:2013.7
A full account of synthetic efforts toward a lowly oxidized taxane framework is presented. A non-natural taxane, dubbed ‘taxadienone’, was synthesized as our first entry into the taxane family of diterpenes. The final synthetic sequence illustrates a seven-step, gram-scale, and enantioselective route to this tricyclic compound in 18% overall yield. This product was then modified further to give (+)-taxadiene
[EN] MULTIFUNCTIONAL RADICAL QUENCHERS AND THEIR USE<br/>[FR] DÉSACTIVATEURS DE RADICAUX LIBRES MULTIFONCTIONNELS ET LEUR UTILISATION
申请人:UNIV ARIZONA
公开号:WO2011103536A1
公开(公告)日:2011-08-25
The present disclosure provides biologically active compounds of formula (I): and pharmaceutically acceptable salts thereof, compositions comprising these compounds, and methods of using these compounds in a variety of applications, such as treatment or suppression of diseases associated with decreased mitochondrial function resulting in diminished ATP production and/or oxidative stress and/or lipid peroxidation.
作者:Yuzuru Kanda、Hugh Nakamura、Shigenobu Umemiya、Ravi Kumar Puthukanoori、Venkata Ramana Murthy Appala、Gopi Krishna Gaddamanugu、Bheema Rao Paraselli、Phil S. Baran
DOI:10.1021/jacs.0c03592
日期:2020.6.10
Taxol® is widely regarded as amongst the most famed natural isolates ever discovered, and has been the subject of innumerable studies in both basic and applied science. Its documented success as an anticanceragent, coupled with early concerns over supply, stimulated a furious worldwide effort from chemists to provide a solution for its preparation through total synthesis. Those pioneering studies
Palladium-catalyzedmonofluoromethylation of substituted 2-bromo-1,3-dienes using fluorobis(phenylsulfonyl)methane (FBSM) as a pronucleophile gave previously unknown monofluoromethylated allenes in high yields, which are the isosteres of biologically attractive allenic alcohols.
Synthesis of the Taxol Core via Catalytic Asymmetric 1,4-Addition of an Alkylzirconium Nucleophile
作者:Jiao Yu Joseph Wang、Stephen P. Fletcher
DOI:10.1021/acs.orglett.0c01165
日期:2020.6.5
The Taxol core was prepared in five steps via a key copper-catalyzedasymmetricconjugateaddition trapping sequence. The use of a bromodiene-derived alkylzirconium nucleophile followed by trapping with POCl3/DMF gave a highly functionalized intermediate featuring a quaternarycenter in 69% yield with 92% ee. After 1,2-addition, Suzuki–Miyaura cross-coupling, allylic oxidation, and a type II intramolecular