The divergent asymmetric synthesis of kalafungin, 5-epi-frenolicin B and related pyranonaphthoquinone antibiotics
作者:Christopher D. Donner
DOI:10.1016/j.tet.2012.10.012
日期:2013.1
A divergent, asymmetric method for the synthesis of pyranonaphthoquinones is reported. The synthetic strategy applies a Staunton–Weinreb annulation between substituted ortho-toluates and the (R)-pyran-2-one 7 to construct the key naphthopyranone intermediates. Stereoselective introduction of either a methyl or propyl C5 alkyl substituent by use of Grignard addition/silane-mediated reduction and a sequence
Biochemical and Structural Studies of the Carminomycin 4-O-Methyltransferase DnrK
作者:Elnaz Jalali、Fengbin Wang、Brooke R. Overbay、Mitchell D. Miller、Khaled A. Shaaban、Larissa V. Ponomareva、Qing Ye、Hoda Saghaeiannejad-Esfahani、Minakshi Bhardwaj、Andrew D. Steele、Christiana N. Teijaro、Ben Shen、Steven G. Van Lanen、Qing-Bai She、S. Randal Voss、George N. Phillips、Jon S. Thorson
DOI:10.1021/acs.jnatprod.3c00947
日期:2024.4.26
4-O-methyltransferase DnrK are described, with an emphasis on interrogating the acceptor substrate scope of DnrK. Specifically, the evaluation of 100 structurally and functionally diverse naturalproducts and naturalproduct mimetics revealed an array of pharmacophores as productive DnrK substrates. Representative newly identified DnrK substrates from this study included anthracyclines, angucyclines, anthraquinone-fused
A Diastereoselective Oxa-Pictet–Spengler-Based Strategy for (+)-Frenolicin B and <i>epi</i>-(+)-Frenolicin B Synthesis
作者:Yinan Zhang、Xiachang Wang、Manjula Sunkara、Qing Ye、Larissa V. Ponomereva、Qing-Bai She、Andrew J. Morris、Jon S. Thorson
DOI:10.1021/ol4027649
日期:2013.11
An efficient diastereoselective oxa-Pictet - Spengler reaction strategy was developed to construct benzoisochroman diastereomers. The utility of the reaction was demonstrated in the context of both the total synthesis of naturally occurring pyranonaphthoquinones (+)-frenolicin B and epi-(+)-frenolicin B as well as a range of frenolicin precursor analogs. The method is versatile and offers exquisite stereocontrol and, as such, offers a synthetic advance for the synthesis of pyranonaphthoquinone analogs.