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Communication | Special issue | Vol 103, No. 1, 2021, pp.225-230
Published online, 3rd December, 2020
DOI: 10.3987/COM-20-S(K)41
Preparation of Optically Pure Dinuclear Cobalt(III) Complex with Λ-Configuration as a Dianionic Chiral Catalyst

Mohamed S. H. Salem, Ankit Kumar, Makoto Sako, Tsukasa Abe, Shinobu Takizawa,* and Hiroaki Sasai*

*The Institute of Scientific and Industrial Research, Osaka University, 8-1, Mihogaoka, Ibaraki, Osaka 567-0047, Japan


The disodium salt of enantiomerically pure dimeric Λ-cobalt(III) complex 1 was prepared in one-pot from sodium triscarbonatocobaltate(III) and Schiff base ligand (Ra,S,S)-2 formed by the condensation of (R)-3,3ʹ-diformyl-2,2ʹ-dihydroxy-1,1ʹ-binaphthyl 3 with (S)-tert-leucine 4. Preliminary screening of 1 as a chiral catalyst was conducted for the bromocyclization of a tryptamine derivative.