Synthesis of Azide-alkyne Fragments for 'Click' Chemical Applications. Formation of Chiral 1,4-Disubstituted-(β-alkyl)-γ-1,2,3-triazole Scaffolds from Orthogonally Protected Chiral β-Alkyl-trialkylsilyl-γ-pentynyl Azides and Chiral β-Alkyl-γ-pentynyl-alcohols
作者:Jonathan A. Davies、Freya M. Bull、Paul D. Walker、Angus N. M. Weir、Rob Lavigne、Joleen Masschelein、Thomas J. Simpson、Paul R. Race、Matthew P. Crump、Christine L. Willis
DOI:10.1021/acs.orglett.0c02190
日期:2020.8.21
The kalimantacins make up a family of hybrid polyketide-nonribosomal peptide-derived naturalproducts that display potent and selective antibiotic activity against multidrug resistant strains of Staphylococcus aureus. Herein, we report the first total synthesis of kalimantacin A, in which three fragments are prepared and then united via Sonogashira and amide couplings. The enantioselective synthetic
Kalimantacins 组成了一个混合聚酮化合物-非核糖体肽衍生的天然产物家族,这些产物对金黄色葡萄球菌的多重耐药菌株显示出有效和选择性的抗生素活性。在此,我们报告了卡里曼泰星 A 的首次全合成,其中制备了三个片段,然后通过 Sonogashira 和酰胺偶联进行了结合。对映选择性合成方法是收敛的,为结构-活性关系研究和临床评估开辟了进一步的卡里曼泰星和类似物的路线。
1,4-Pentenyne as a Five-Carbon Synthon for Efficient and Selective Syntheses of Natural Products Containing 2,4-Dimethyl-1-penten-1,5-ylidene and Related Moieties by Means of Zr-Catalyzed Carboalumination of Alkynes and Alkenes
作者:Gangguo Zhu、Ei-ichi Negishi
DOI:10.1002/chem.200701512
日期:2008.1
Two highly efficient protocols for enantioselective synthesis of 2,4-dimethyl-1-penten-1,5-ylidene derivatives involve the combined use of the Zr-catalyzed methylalumination of alkynes (ZMA) and the Zr-catalyzed asymmetric carboalumination of alkenes (ZACA). The ZMA/ZACA protocol has been applied to the synthesis of a nafuredin intermediate 14 and a potential intermediate 18 for milbemycin beta 3,
Convergent Synthesis and Discovery of a Natural Product-Inspired Paralog-Selective Hsp90 Inhibitor
作者:Valer Jeso、Lisa Cherry、Todd K. Macklin、Subhas Chandra Pan、Philip V. LoGrasso、Glenn C. Micalizio
DOI:10.1021/ol2019828
日期:2011.10.7
A convergent synthesis of benzoquinone ansamycin analogs is described that proceeds by a sequence of metallacycle-mediated alkyne-alkyne coupling, followed by site- and stereoselective dihydroxylation and global carbamate formation. These studies have led to (1) validation of alkyne-alkyne coupling to produce geldanamycin analogs that lack the problematic quinone, (2) the discovery that C6-C7 bis-carbamate functionality is compatible with Hsp90 inhibition, and (3) the identification of 1 as a nonquinone geldanamycin-inspired paralog-selective Hsp90 inhibitor.