scheme2
![Chiral phosphoric acid catalyzed redox deracemization of triarylmethanes](https://image.oaes.cc/ee8fd4c3-9eb7-4279-a679-fd8fd3af0c22/5635.scheme.2.jpg)
Scheme 2. Gram-scale Reaction and Product Derivatization. [a] Reaction conditions:1 (0.4 mmol), DDQ (0.44 mmol), H1 (0.6 mmol). Ee was determined by chiral HPLC analysis. Isolated yield. The specified temperature for each example is for the second step (reduction). [b] Run with 0.5 mol% of catalyst. [c] Run with 1 mol% of catalyst. [d] Run with 2 mol% of catalyst. [e] Run with 5 mol% of catalyst.