Studies directed toward the synthesis of aspidophytine: construction of its perhydroquinoline core
Türkmen, Y. E.
Rawal, V. H.
Journal of Organic Chemistry
American Chemical Society
10454 - 10462
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We have developed an efficient route for the synthesis of the perhydroquinoline core of the indole alkaloid aspidophytine (2), starting from commercially available and inexpensive 3-acetylpyridine. This densely functionalized perhydroquinoline core displays four contiguous stereocenters including an all-carbon quaternary center. The synthetic sequence features a highly effective Diels-Alder reaction using a carbamate-substituted siloxy diene accompanied by a spontaneous intramolecular substitution of the newly formed 3°-alkyl bromide with a carbamate group. The installation of the electron-rich aniline moiety was accomplished via a TBSOTf-mediated intramolecular aza-Michael reaction, and the relative stereochemistry of the aza-Michael product (30) was confirmed by X-ray crystallographic analysis. Among the useful transformations that were developed through this study is a highly enantioselective Diels-Alder reaction of a versatile cyclic carbamate siloxy diene.
X ray crystallography
Enantioselective Diels-Alder reactions
X-ray crystallographic analysis
Published Version (Please cite this version)http://dx.doi.org/10.1021/acs.joc.6b01574
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