Scheme 2.
Multigram-Scale Synthesis of 3 and Further Transformations
Reaction conditions: (a) Mg3N2, MeOH, 90°C, 24 hr; (b) aniline (1.5 equiv), AcOH, reflux, 18 hr; (c) TsOH (50 mol %), toluene, 110°C, 8 hr.
See also Figures S112–S117.
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