Total Synthesis of Bistramide A and Its 36(
<i>Z</i>
) Isomers: Differential Effect on Cell Division, Differentiation, and Apoptosis
作者:Loïc Tomas、Gustav Boije af Gennäs、Marie Aude Hiebel、Peter Hampson、David Gueyrard、Béatrice Pelotier、Jari Yli‐Kauhaluoma、Olivier Piva、Janet M. Lord、Peter G. Goekjian
DOI:10.1002/chem.201102462
日期:2012.6.11
The total synthesis of bistramide A and its 36(Z),39(S) and 36(Z),39(R) isomers shows that these compounds have different effects on cell division and apoptosis. The synthesis relies on a novel enol ether‐forming reaction for the spiroketal fragment, a kinetic oxa‐Michael cyclization reaction for the tetrahydropyran fragment, and an asymmetric crotonylation reaction for the amino acid fragment. Preliminary
Jackpot: Two for one! Concise and highly convergent syntheses of the immunosuppressive agent FR252921 and the related antimicrobial natural product pseudotrienic acid B were achieved from one common intermediate by using optically active titanium complexes to control the configuration of the stereogenic centers, a highly stereo‐ and regioselective cross‐metathesis to generate the triene moieties, and
We have developed an efficient and highly stereocontrolled synthesis of bistramide A, a selective activator of protein kinase C isotype delta. Our synthetic strategy featured a novel bidirectional approach for spiroketal construction based on the ring-opening/cross-metathesis sequence employing a highly strained cyclopropenone acetal. The synthesis afforded the final target with the longest linear sequence of 15 steps and provided unambiguous structural determination of bistramide A, including assignment of the previously unknown C(37) stereochemistry.