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Stereoselective Synthesis of Swainsonines from Pyridines

Heimgärtner, Gerres ; Raatz, Dirk ; Reiser, Oliver


An efficient synthesis of (−)-swainsonine and (−)-2,8a-di-epi-swainsonine was developed starting from readily available 2-pyridinecarbaldehyde and 3-hydroxypyridine. In particular, it was demonstrated that the mixture of simple indolizidines, i.e. lentiginosine and epi-lentiginosine, being readily available by a number of different synthetic routes, can be directly converted to swainsonine.

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