Stereocontrolled Synthesis of a Possible Stereoisomer of Laurenidificin and a Formal Total Synthesis of (+)-Aplysiallene Featuring a Stereospecific Ring Contraction

The Journal of Organic Chemistry
Shoji KobayashiAraki Masuyama

Abstract

We report a highly stereocontrolled total synthesis of one of the possible stereoisomers of laurenidificin. Highlights of the synthesis include the formation of the 2,6-dioxabicyclo[3.3.0]octane framework by a stereospecific bromolactonization-α-bromination-ring contraction sequence, followed by a stereoselective propargylation, an insertion of the Z-enyne side chain by a hydroindation/cross coupling reaction, and ethylation at C13 with an organocuprate reagent. While the synthetic compound was not identical to the natural product, the absolute stereochemistry of the natural product was proposed on the basis of NMR analyses. Moreover, a formal total synthesis of (+)-aplysiallene was achieved by extending the ring contraction strategy.

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Citations

Sep 25, 2019·Chemistry, an Asian Journal·Shoji KobayashiAraki Masuyama
Sep 24, 2020·Organic & Biomolecular Chemistry·Rodney A FernandesRamdas S Pathare
Mar 7, 2020·Journal of the American Chemical Society·Marc HeinrichAlois Fürstner
Dec 19, 2020·Organic Letters·Norihiko TakedaMasafumi Ueda
Nov 9, 2019·The Journal of Organic Chemistry·Shoji KobayashiAraki Masuyama
Mar 7, 2020·The Journal of Organic Chemistry·Sofiane HocineStephen Hanessian

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