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. Author manuscript; available in PMC: 2011 Apr 6.
Published in final edited form as: Pure Appl Chem. 2010 Apr 6;82(9):1735–1748. doi: 10.1351/pac-con-09-11-14

Scheme 4.

Scheme 4

Fischer Indole Formation Approach. Key: (a) Troc-N=N-Troc, TFA, 95%; (b) Zn dust, AcOH, 88%; (c) NaNO2, aqueous HCl, −5 °C; (d) 38, aq KOH, EtOH, −5 °C, 81%; (e) TsOH, toluene, 80 °C, < 5%.