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Beilstein J. Org. Chem. 2013, 9, 1235–1242, doi:10.3762/bjoc.9.140
Graphical Abstract
Scheme 1: The Pictet–Spengler reaction of tryptamine with 4-tolualdehyde.
Figure 1: The two Pictet–Spengler substrates employed in the TCT catalyzed cyclization.
Scheme 2: Synthesis of the Pictet–Spengler substrate 4. Reaction conditions: (a) K2CO3, DMF, 80 °C, 3 h; (b) ...