The first total synthesis of the decahydroquinoline-alkaloids lepadin F and G is described. As key steps, the decahydroquinoline skeleton has been synthesized by utilizing a tandem ene-yne-ene ring closing metathesis of an acyclic precursor followed by a stereoselective hydrogenation of the resulting diene moiety. The selectivity of these two steps was achieved by a well-directed hydroxyl protection strategy. The synthesized compounds were found to be enantiomers of natural lepadin F and G, consequently the absolute configuration of the natural compounds could be assigned.
2008 Pyran derivatives R 0340 Synthesis of cis-Fused Pyranopyran and Pyranopyridine Templates by Ring Rearrangement Metathesis. -Two novel templates (IX) are prepared on a multigram scale via the ring rearrangement metathesis of compound (VI) as a key step. -(NIETHE, A.; BLECHERT*, S.; Heterocycles 74 (2007) 1, 803-817; Inst.
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