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- W2073444803 abstract "Abstract Racemic [1,1′]binaphthalenyl-2,2′-diol (BINOL, (±)- 1 ) has been esterified with various commercially available N -protected- l -amino acids, giving the corresponding diastereomeric esters. Their TLC separation factors were highly dependent on the amino acid pattern. Diesters of (±)- 1 and N (α)-Boc-tryptophan ( 3a ) showed unusually large separation factors, which allowed their efficient separation by simple column chromatography. Removal of the tryptophan moieties under very mild conditions furnished each enantiomer of 1 in high overall yield and 100% ee. This procedure was also successful for the resolution of racemic 6,6′-dibromo-[1,1′]binaphthalenyl-2,2′-diol (6,6′-dibromo-BINOL, (±)- 2 )." @default.
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- W2073444803 date "2002-12-01" @default.
- W2073444803 modified "2023-10-17" @default.
- W2073444803 title "Convenient and highly efficient chromatographic resolution of BINOL and of 6,6′-dibromo-BINOL via N(α)-Boc-tryptophan esters" @default.
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- W2073444803 doi "https://doi.org/10.1016/s0040-4039(02)02268-2" @default.
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