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Reaction conditions: (i) 1. 5, AcOH, THF/MeOH, 4 Å MS. 2. NaCNBH3; (ii) 4-CZIPN, Co(dmgH)(dmgH2)Cl2, HK2PO4, Et3N, DMF, 440 nm light; (iii) H2, 10% Pd/C, EtOH; (iv) AD-mix-α, tBuOH/water; (v) AD-mix-β, tBuOH/water.
