Strategy Evolution in a Skeletal Remodeling and C–H Functionalization-Based Synthesis of the Longiborneol Sesquiterpenoids
作者:Robert F. Lusi、Goh Sennari、Richmond Sarpong
DOI:10.1021/jacs.2c08136
日期:2022.9.21
Detailed herein are our synthesisstudies of longiborneol and relatednaturalproducts. Our overarching goals of utilizing a “camphor first” strategy enabled by skeletal remodeling of carvone, and late-stage diversification using C–H functionalizations, led to divergent syntheses of the target naturalproducts. Our initial approach proposed a lithiate addition to unite two fragments followed by a Conia-ene
[GRAPHICS]We have accomplished the total synthesis of (+/-)-culmorin from the readily available ketone (11 steps, 46% overall yield). The tricyclo[6.3.0.0(3,9)]undecan-10-one skeleton, the culmorin framework, was constructed via the intramolecular double Michael addition of the cyclopentenone having an alpha beta-unsaturated ester moiety by using LHMDS, The stereochemistry of newly generated four stereogenic centers was perfectly controlled by the reaction.
Ashley; Hobbs; Raistrick, Biochemical Journal, 1937, vol. 31, p. 385,396
作者:Ashley、Hobbs、Raistrick
DOI:——
日期:——
Total synthesis of nine longiborneol sesquiterpenoids using a functionalized camphor strategy
作者:Robert F. Lusi、Goh Sennari、Richmond Sarpong
DOI:10.1038/s41557-021-00870-4
日期:2022.4
inspires the development of synthesis strategies to access important classes of molecules. In the 1960s, Corey and coworkers demonstrated a visionary preparation of the terpenoid longifolene, using ‘strategic bond analysis’ to craft a synthesis route. This approach proposes that efficient synthesis routes to bridged, polycyclic structures should be formulated to introduce the bulk of the target’s topological
procedure for the synthesis of culmorin sulfates was developed. Diastereo- and regioselective glucosylation of culmorin (1) was achieved by exploiting or preventing unexpected acyl transfer when using different glucosyl donors. The treatment of a wheat suspension culture with culmorin (1) revealed an in planta conversion of culmorin into culmorin-8-glucoside (6) and culmorin acetate, but no sulfates or