| Literature DB >> 18489177 |
Abstract
An enantioselective synthesis of the Hsp90 inhibitor geldanamycin was achieved in 20 linear steps and 2.0% overall yield from 2-methoxyhydroquinone. The synthesis is highlighted by a regio- and stereoselective hydroboration reaction; a Sc(OTf)(3)/Et(3)SiH-mediated pyran ring-opening reaction; an enantioselective crotylation to simultaneously install the C8-C9 (E) -trisubstituted olefin, the C10 and C11 stereocenters; a chelation-controlled asymmetric metallated acetylide addition; and an intramolecular copper(I)-mediated aryl amidation reaction to close the 19-membered macrolactam.Entities:
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Year: 2008 PMID: 18489177 PMCID: PMC2430885 DOI: 10.1021/ol800749w
Source DB: PubMed Journal: Org Lett ISSN: 1523-7052 Impact factor: 6.005