Chemistry Letters, Vol.31, No.6, 600-601, 2002
(R)-2,2'-bis(stannyl)-1,1'-binaphthyls as a new chiral bis-metallic binaphthyl catalyst
Dilithiation followed by bis-stannylation with Me3SnCl of (R)-2,2'-dibromo-1,1'-binaphthyl (2) and the subsequent redistribution reaction of resulting (R)-2,2'-bis(trimethylstannyl)-1,1'-binaphthyl (6) with SnCl4 gave the novel chiral Lewis acid catalyst (R)-2,2-bis(dichloromethylstannyl)-1, 1'-binaphthyl (4). The catalytic properties of 4 and its triflate 5 were investigated as the first chiral bis-metallic binaphthyl catalyst.