The α-ally homoproline ester 8, obtained by Claisen rearrangement of the allyl ester 7 or direct C-allylation of the homoproline methyl ester 9 has been converted into (–)-trachelanthamidine 4a and (–)-isoretronecanol 4b while allylation of the enolate derived from the lactone 13a followed by related transformations leads stereospecifically to turneforcidine 12.
D. W. Knight, A. C. Shares and P. T. Gallagher, J. Chem. Soc., Perkin Trans. 1, 1991, 1615 DOI: 10.1039/P19910001615
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