107495-44-3Relevant articles and documents
Enantioselective Total Synthesis and Structural Revision of Dysiherbol A
Baars, Julian,Grimm, Isabelle,Blunk, Dirk,Neud?rfl, J?rg-Martin,Schmalz, Hans-Günther
, p. 14915 - 14920 (2021)
A 12-step total synthesis of the natural product dysiherbol A, a strongly anti-inflammatory and anti-tumor avarane meroterpene isolated from the marine sponge Dysidea sp., was elaborated. As key steps, the synthesis features an enantioselective Cu-catalyzed 1,4-addition/enolate-trapping opening move, an Au-catalyzed double cyclization to build up the tetracyclic core-carbon skeleton, and a late installation of the C5-bridgehead methyl group via proton-induced cyclopropane opening associated with spontaneous cyclic ether formation. The obtained pentacyclic compound (corresponding to an anhydride of the originally suggested structure for dysiherbol A) showed identical spectroscopic data as the natural product, but an opposite molecular rotation. CD-spectroscopic measurements finally confirmed that both the constitution and the absolute configuration of the originally proposed structure of (+)-dysiherbol A need to be revised.
Diastereoselective synthesis of complex cis-hexahydroindanes by reductive alkylation
Kaplan, Hilan Z.,Rendina, Victor L.,Kingsbury, Jason S.
, p. 4620 - 4626 (2013/06/27)
An efficient and operationally simple approach to complex cis-hexahydroindanes is reported. Upon Birch reduction of unprotected, C4-alkylated tetrahydroindanols and electrophilic trapping of the tetrasubstituted enolate, cis-fused products are formed with a new stereogenic quaternary carbon. The reaction is convergent, completely diastereoselective, and shows a broad scope with regard to the electrophile.
