Abstract
SB-203207 is an altemicidin-type alkaloid that potently inhibits isoleucyl tRNA synthetase activity. Its main structural feature is a hexahydro-6-azaindene framework containing a unique β-hydroxy α,α-disubstituted α-amino acid moiety on the cyclopentane portion. Herein we have established a method for constructing the four contiguous nitrogen-containing stereogenic centers of SB-203207 by using as key steps the stereoselective alkylation of bowl-shaped tricyclic lactone to construct a quaternary carbon at C1, the stereoselective hydroboration-oxidation reaction to install the C2 hydroxy group, and the Curtius rearrangement to introduce a nitrogen atom onto the C1 quaternary carbon.
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