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ee-values of the starting materials (Boc protected amino acids), the intermediates 1-(R), 1-(S) and 1-(rac) being the intermediates after anilide formation; 2A-(R), 2A-(S) and 2A-(rac) being the Boc deprotected intermediate and final compounds 2B-(R), 2B-(S) and 2B-(rac) during synthetic route.
| Boc-Phe- | 1- | 2A- | 2B- | |
|---|---|---|---|---|
| ee-value [%] | ||||
| (R) | 99.82 | 99.80 | 99.92 | 99.70 |
| (S) | 100.00 | 99.34 | 99.84 | 99.79 |
| (rac) | 0.24 | 0.64 | 0.47 | 0.06 |
