Journal
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Volume 2016, Issue 5, Pages 946-957Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.201501489
Keywords
Total synthesis; Natural products; Terpenes; Oxygen heterocycles; Configuration determination; Chiral pool
Categories
Funding
- National Natural Science Foundation of China (NSFC) [21532002, 21372248, 21172247]
- Chinese Academy of Sciences
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The long-known furanoterpenes furospongin-1 and dihydrofurospongin-2 were synthesized for the first time using a chiral-pool-based route in an effort to secure the previous configurational assignments. The key C-11 stereogenic centre was taken from D-mannose, and the C-13 alkyl centre was installed exploiting the chirality of mannose. Due to deprotonation and/or enolization of the building blocks used, introduction of the furan moieties was problematic, and so some reactions had to be avoided. The trisubstituted alkene was most satisfactorily constructed using a Julia-Kocienski olefination in 1,2-dimethoxyethane, with the best (E)/(Z) ratio achieved using a secondary sulfone. The synthetic samples not only provided the first unequivocal piece of evidence for the C-13 configuration of both natural products, but also confirmed the absolute configuration at C-11 of furospongin-1.
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