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
Synthesis of the spiroketal fragment of bistramide A via an exocyclic enol ether
作者:Loïc Tomas、David Gueyrard、Peter G. Goekjian
DOI:10.1016/j.tetlet.2010.06.006
日期:2010.9
An efficient synthesis of the spirocyclic fragment 1 of bistramides is reported. An olefination reaction of lactone 4 with sulfone 5 gave the enolether3, which upon cyclization in acidic media provided the spiroketal ring system. This compound was then converted into the C19–C36 fragment of the bistramides via successive Julia–Kocienski and Horner–Emmons olefinations.