Synthesis of Heterocyclic Terpenoids by Promiscuous Squalene-Hopene Cyclases
作者:Miriam Seitz、Per-Olof Syrén、Lisa Steiner、Janosch Klebensberger、Bettina M. Nestl、Bernhard Hauer
DOI:10.1002/cbic.201300018
日期:2013.3.4
Promiscuous enzymes: The substrate promiscuity of squalene–hopenecyclases has been explored and applied in the enzyme‐catalyzed synthesis of heterocyclic terpenoids. Features of this work include cyclizationreactions without pyrophosphate activation, and stereospecific ring closure of substrates of varying chain length and terminal nucleophile. This provides a biocatalytic alternative to traditional
First Enantioselective Synthesis of Marine Diterpene Ambliol-A
作者:Stefano Serra、Veronica Lissoni
DOI:10.1002/ejoc.201403610
日期:2015.4
The first enantioselective synthesis of furanditerpene ambliol-A, which is a major metabolite of marine sponge Dysidea amblia, has been accomplished by starting from racemic α-ionone. The key steps of the synthesis include lipase-mediated resolution of 4-hydroxy-γ-ionone, its stereoselective transformation into trans-α-epoxy-dihydroionone, C2 homologation to trans-α-epoxy-monocyclofarnesyl acetate
Stereoselective Directed Cationic Cascades Enabled by Molecular Anchoring in Terpene Cyclases
作者:Andreas Schneider、Philipp Jegl、Bernhard Hauer
DOI:10.1002/anie.202101228
日期:2021.6.7
cascades by exploiting the ability of anchoring dynamic substrates in the active site of terpene cyclases via designed hydrogen bonding. Thereby, it is possible to induce “directed” cyclizations in contrast to established “non-stop” cyclizations (99:1) and predestinate cascade termination at otherwise catalytically barely accessible intermediates. As a result, we are able to provide efficient access to
efficient agent for electrophilic olefin cyclizations with internalnucleophilictermination, in a similar manner that is well-established with fluorosulfonic acid. Its availability, lower price and relatively lesser handling problems makes ClSO3H an advantageous cyclizing agent particularly for high-scale applications. The stereochemical outcome of these cyclizations has been rationalized.