Publikation: A method for investigating the stereochemical course of terpene cyclisations
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Three sesquiterpene cyclases from Streptomyces scabei 87.22, Streptomyces venezuelae ATCC 10712 and Streptomyces clavuligerus ATCC 27064 were characterised and their products were identified as (-)-neomeranol B, (+)-isodauc-8-en-11-ol and (+)-intermedeol, respectively. The stereochemical courses of the terpene cyclisations were investigated by use of various (13)C-labelled FPP isotopomers. A quick and easy test was developed that allows to distinguish reprotonations of olefinic double bonds in neutral intermediates from the two stereoheterotopic faces. The method makes use of incubating (13)C-FPP isotopomers labelled at the reprotonated carbon in deuterium oxide and subsequent HSQC analysis of the product. A 1,7-cyclisation towards (+)-isodauc-8-en-11-ol was followed by use of (1,7-(13)C2)FPP. Surprisingly, the (+)-isodauc-8-en-11-ol also accepted (2Z,6E)-FPP resulting in the same product profile as obtained from (2E,6E)-FPP.
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RABE, Patrick, Jan RINKEL, Tim A. KLAPSCHINSKI, Lena BARRA, Jeroen S. DICKSCHAT, 2016. A method for investigating the stereochemical course of terpene cyclisations. In: Organic & Biomolecular Chemistry. Royal Society of Chemistry. 2016, 14(1), pp. 158-164. ISSN 1477-0520. eISSN 1477-0539. Available under: doi: 10.1039/c5ob01998bBibTex
@article{Rabe2016-01-07metho-57621, year={2016}, doi={10.1039/c5ob01998b}, title={A method for investigating the stereochemical course of terpene cyclisations}, number={1}, volume={14}, issn={1477-0520}, journal={Organic & Biomolecular Chemistry}, pages={158--164}, author={Rabe, Patrick and Rinkel, Jan and Klapschinski, Tim A. and Barra, Lena and Dickschat, Jeroen S.} }
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