Scheme 5.
Schreiber’s approach to pre-encoding skeletal information using the Achmatowicz reaction. Reagents and conditions: (1) N-bromosuccinimide, NaHCO3, NaOAc, THF-H2O (4 : 1), rt, 1 h; PPTS, CH2Cl2, 40-45 °C, 20 h.
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