method for the efficient syntheses of optically active 1-alkyl homoallylic amines in yields up to 95%, 13.5:1 dr, and 98% ee under mild, aqueous reaction conditions, via the Rh-catalyzed asymmetric allylation of aliphatic aldimines. This method provides a streamlined synthetic platform for the preparation of indolizidine and piperidine alkaloids, thus demonstrating its usefulness.
A Synthesis of Pseudoconhydrine and Its Epimer via Hydroformylation and Dihydroxylation
作者:Roderick W. Bates、K. Sivarajan、Bernd F. Straub
DOI:10.1021/jo2008912
日期:2011.8.19
A synthesis of the alkaloid pseudoconhydrine and its epimer has been achieved using tandem hydroformylation–condensation to form the six-membered ring and stereoselective dihydroxylation to introduce oxygenation. The stereoselectivity of dihydroxylation can be explained by lipophilic and electrostatic effects, supported by DFT calculations. The alkaloids can be obtained either by regioselective dehydroxylation