Scheme 3. Synthesis of 30 and 32.
Reagents and conditions: (a) NH4SCN, EtOH, 78 °C; (b) methyl chlorooxoacetate, THF, rt; (c) DBU, THF, 50 °C; (d) PhCH2CH2I, BSA, acetonitrile, 82 °C.
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