Total Synthesis of the Structure Proposed for Prekinamycin
作者:Frank M. Hauser、Maotang Zhou
DOI:10.1021/jo9609891
日期:1996.1.1
Studies on the Mechanism of Action of Prekinamycin, a Member of the Diazoparaquinone Family of Natural Products: Evidence for Both sp<sup>2</sup> Radical and Orthoquinonemethide Intermediates
作者:Ken S. Feldman、Kyle J. Eastman
DOI:10.1021/ja0642616
日期:2006.9.1
The putative reductive activation chemistry of the diazoparaquinone antibiotics was modeled with Bu3Sn-H and prekinamycin dimethyl ether along with prekinamycin itself. Reaction in various combinations of aromatic solvents, with and without the nucleophile benzylmercaptan present, led to isolation of both radical-trapping arene adducts and nucleophilic capture benzyl thioether products. On the basis of these product distribution studies, the intermediacies of, first, a cyclopentenyl radical and, next, an orthoquinonemethide electrophile are postulated.
A Proposal for the Mechanism-of-Action of Diazoparaquinone Natural Products
作者:Ken S. Feldman、Kyle J. Eastman
DOI:10.1021/ja053880w
日期:2005.11.1
Treatment of the representative diazoparaquinone prekinamycin dimethyl ether with Bu3SnH/AIBN in aromatic solvents furnishes moderate-to-good yields of formal aryl adducts wherein a molecule of solvent is attached to the carbon (C(11)) previously bearing the diazo function. Substituent studies provide evidence in support of a radical aromatic substitution mechanism, in which radical addition to the diazoparaquinone function generates an intermediate C(11) vinylic radical.
Syntheses of Prekinamycin and a Tetracyclic Quinone from Common Synthetic Intermediates
Towards total synthesis of a series of kinamycin and related antibiotics via common synthetic intermediates, total synthesis of prekinamycin was achieved via Suzuki coupling of naphthaleneboronic acid and bromobenzene derivative, intramolecular FriedelCrafts reaction of 2‐(naphthalen‐2‐yl)benzoic acid, and diazotization in ten steps from 3,5‐dimethylphenol. Syntheticstudies towards kinamycin antibiotics