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Synlett 1990; 1990(10): 633-635
DOI: 10.1055/s-1990-21194
DOI: 10.1055/s-1990-21194
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A New Entry into Sulfur Containing Ferrocenylphosphine Ligands for Asymmetric Catalysis
Further Information
Publication History
Publication Date:
08 March 2002 (online)
The preparation of (R)-1-[(S)-1′,2-bis(diphenylphosphino)ferrocenyl]ethylthiol (3a) is described. Starting from the four stereoisomeric N-methyl-ephedrine derivatives 4a-d, the corresponding 1,1,2-trimethyl-3-phenylaziridinium iodides 6a-d were obtained in situ by extrusion of the hydroxyl group using an α-iodoenamine. Addition of the lithium salt of 3a to 6a-d lead to the formation of novel ligands 7a-d, N,N-dimethyl-2-{1-[1′,2-bis(diphenylphosphino)ferrocenyl]ethylthio}-1-methyl-2-phenylethylamines, which were used in the gold(I)-catalyzed aldol reaction.