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Construction of Metal-Centered Chirality: Diastereoselective Addition of the Meerwein Reagent (Me3OBF4) to Rhodium Carbonyl Complexes Having the Cp‘-P Ligand
journal contribution
posted on 2004-04-26, 00:00 authored by Yasutaka Kataoka, Yousuke Nakagawa, Atsushi Shibahara, Tsuneaki Yamagata, Kazushi Mashima, Kazuhide TaniReaction of the rhodium(I) carbonyl complexes [η5:η1-{3-(R)Ind-P}n=2]Rh(CO) (1; R = H
(a), Et (b), Cy (c), (1‘S,2‘S,5‘R)-neomenthyl (NM) (d), (1‘R,2‘R,5‘R)-neoisomenthyl (NIM)
(e)) with the Meerwein reagent (Me3OBF4) afforded the cationic rhodium(III) complexes [[η5:η1-{3-(R)Ind-P}n=2]RhMe(CO)]BF4, having metal-centered chirality, in good to excellent yields.
When a bulkier substituent (R) was used, the corresponding cationic complex was obtained
with higher diastereoselectivity. In the case of using an optically active substituent such as
NM or NIM, complete stereodiscrimination around the rhodium center by the Meerwein
reagent occurred to give the cationic complexes with 100% de.