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A method for investigating the stereochemical course of terpene cyclisations

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2016

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Rabe, Patrick
Rinkel, Jan
Klapschinski, Tim A.
Dickschat, Jeroen S.

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Organic & Biomolecular Chemistry. Royal Society of Chemistry. 2016, 14(1), pp. 158-164. ISSN 1477-0520. eISSN 1477-0539. Available under: doi: 10.1039/c5ob01998b

Zusammenfassung

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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ISO 690RABE, 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/c5ob01998b
BibTex
@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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