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    Publication Date: 2014-10-11
    Description: Cycloaddition is an essential tool in chemical synthesis. Instead of using light or heat as a driving force, marine sponges promote cycloaddition with a more versatile but poorly understood mechanism in producing pyrrole-imidazole alkaloids sceptrin, massadine, and ageliferin. Through de novo synthesis of sceptrin and massadine, we show that sponges may use single-electron oxidation as a central mechanism to promote three different types of cycloaddition. Additionally, we provide surprising evidence that, in contrast to previous reports, sceptrin, massadine, and ageliferin have mismatched chirality. Therefore, massadine cannot be an oxidative rearrangement product of sceptrin or ageliferin, as is commonly believed. Taken together, our results demonstrate unconventional chemical approaches to achieving cycloaddition reactions in synthesis and uncover enantiodivergence as a new biosynthetic paradigm for natural products.〈br /〉〈br /〉〈a href="" target="_blank"〉〈img src="" border="0"〉〈/a〉   〈a href="" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ma, Zhiqiang -- Wang, Xiaolei -- Wang, Xiao -- Rodriguez, Rodrigo A -- Moore, Curtis E -- Gao, Shuanhu -- Tan, Xianghui -- Ma, Yuyong -- Rheingold, Arnold L -- Baran, Phil S -- Chen, Chuo -- R01 GM073949/GM/NIGMS NIH HHS/ -- R01 GM079554/GM/NIGMS NIH HHS/ -- R01-GM073949/GM/NIGMS NIH HHS/ -- R01-GM079554/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2014 Oct 10;346(6206):219-24. doi: 10.1126/science.1255677.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA. ; Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA. ; Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093, USA. ; Department of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biosynthetic Pathways ; *Cycloaddition Reaction ; Molecular Structure ; Porifera/*metabolism ; Pyrroles/*chemical synthesis/chemistry/metabolism ; Stereoisomerism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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