160084-07-1Relevant articles and documents
Synthesis of (+)-manoalide via a copper(I)-mediated 1,2-metalate rearrangement
Pommier, Agnès,Stepanenko, Viatcheslav,Jarowicki, Krzysztof,Kocienski, Philip J.
, p. 4008 - 4013 (2007/10/03)
An enantiospecific synthesis of the phospholipase A2 inhibitor (+)-(4R)-manoalide is reported in which all 25 carbons of the sesterterpenoid skeleton are constructed from 3-furaldehyde, trimethylalane, oxirane, CO, β-ionone, and propargyl bromide. The overall yield for the longest linear sequence (12 steps) is 12%. Key steps include (a) a zirconium-catalyzed carboalumination reaction to construct the C10-C11 trisubstituted alkene, (b) a Cu(I)-mediated 1,2-metalate rearrangement to construct the C6-C7 trisubstituted alkene, (c) a Sharpless kinetic resolution to secure the (4R)-stereochemistry, (d) generation of a 5-stannyl-2,3-dihydrofuran by Mo-catalyzed cycloisomerization of a homopropargylic alcohol, and (e) construction of the hydroxyfuranone ring by photooxidation of a silylfuran.
Two Syntheses of Manoalide via Heteroatom-Assisted Alkyne Carbometallation
Bury, Paul,Hareau, Georges,Kocienski, Philip,Dhanak, Dashyant
, p. 8793 - 8808 (2007/10/02)
Two approaches to the sesterterpenoid phospholipase A2 inhibitors seco-manoalide (3) and manoalide (1) are described based on carbometallation of propargylic alcohols to generate the functionalised C6-C7 trisubstituted alkene.Both syntheses also deploy the photooxidation of a furan in order to generate a 4-substituted 5-hydroxy-2(5H)-furanone moiety.