Scheme 3.
Synthesis of BA from BE via solid-supported CrO3 oxidation [43]. Reagents and conditions: (i) 2 eq. CrO3/SiO2 (1:10), toluene, 60 min (84%); (ii) 2 eq. KMnO4, acetone, 0 °C, 30 min (~100%).
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