The B-Me-(S)-CBS catalysed borane reduction of centrosymmetric bis-N-Boc tetrahydro photodimer 3 has been achieved with virtually complete enantiotopic group selectivity (>97% ee) and in good yield (76%).
A. C. Spivey, B. I. Andrews, A. D. Brown and C. S. Frampton, Chem. Commun., 1999, 2523 DOI: 10.1039/A908059G
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