Scheme 27.
Access to a possible diastereomer of 5. Reagents and conditions: a) TPAP, NMO, 4Å MS, CH2Cl2, 0 °C to rt, 82%; b) H2NNHTs, MeOH, 45 °C, 63%; c) NaH, THF, 90 °C to 110 °C, 6%.
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