I. Ripoche et al., ASYMMETRIC-SYNTHESIS OF ALKALOID (-)-(2S,4S) SS-20846-A AND ITS C-4 EPIMER, Journal of the Chemical Society. Perkin transactions. I (Print), (20), 1998, pp. 3485-3492
A diastereoselective intramolecular Mannich reaction using;planar chir
al iron dienal complexes is employed to prepare optically pure 2,4-dis
ubstituted piperidines. This methodology is applied to the synthesis o
f natural alkaloids (-)-6 and (-)-7.