Scheme 1.
Syntheses of optically active MenA inhibitors-class Aa.
a Reagents and conditions: (a) Ac2O/Py. (1:1), room temperature; (b) BnBr, NaH, DMF/THF (4:1). 0 °C; (c) TMSNCO, DMAP, CH2Cl2, room temperature.
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