Atropselective syntheses of (−) and (+) rugulotrosin A utilizing point-to-axial chirality transfer
作者:Tian Qin、Sarah L. Skraba-Joiner、Zeinab G. Khalil、Richard P. Johnson、Robert J. Capon、John A. Porco
DOI:10.1038/nchem.2173
日期:2015.3
Chiral, dimeric naturalproducts containing complex structures and interesting biological properties have inspired chemists and biologists for decades. A seven-step total synthesis of the axially chiral, dimeric tetrahydroxanthone naturalproduct rugulotrosin A is described. The synthesis employs a one-pot Suzuki coupling/dimerization to generate the requisite 2,2′-biaryl linkage. Highly selective
The structures of some metabolites of Penicillium diversum: α-and β-diversonolic esters
作者:John S. E. Holker、Eugene O'Brien、Thomas J. Simpson
DOI:10.1039/p19830001365
日期:——
The metabolites of Penicilliumdiversum include the meroterpenoids austinol (1) and isoaustin (2), together with the known poly-β-ketides lichenxanthone (3), alternariol monomethyl ether (4), and two new compounds, α- and β-diversonolicesters, (5) and (6) respectively. The structure elucidation of the latter compounds is based essentially on extensive 1H and 13C n.m.r. spectroscopic studies. The biogenetic
乌头青霉的代谢产物包括甲萜类固醇(1)和异austin(2),以及已知的聚-β-酮类地衣酮(3),链烷醇单甲醚(4)和两种新化合物,α-和β-松香酚。分别为(5)和(6)酯。后一种化合物的结构阐明基本上基于广泛的1 H和13 C nmr光谱研究。讨论了这些化合物的生物遗传意义。
Vinylogous Addition of Siloxyfurans to Benzopyryliums: A Concise Approach to the Tetrahydroxanthone Natural Products
作者:Tian Qin、Richard P. Johnson、John A. Porco
DOI:10.1021/ja110698n
日期:2011.2.16
A concise approach to the tetrahydroxanthone natural products employing vinylogous addition of siloxyfurans to benzopyryliums and a late-stage Dieckmann cyclization has been developed. With this methodology, chiral, racemic forms of the natural products blennolides B and blennolide C have been synthesized in a maximum of four steps from a 5-hydroxychromone substrate. The regio- and diastereoselectivity of the vinylogous additions was probed using computational studies, which suggested the involvement of Diets Alder-like transition states.
Total Syntheses and Structural Revision of α- and β-Diversonolic Esters and Total Syntheses of Diversonol and Blennolide C
unsaturated aldehydes. This strategy provides a new solution for the preparation of monomeric tetrahydroxanthones bearing different functional groups at C-12. As a synthetic application, the asymmetric formal synthesis of rugulotrosin A was achieved.