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Stepwise synthesis of N1-C2 linked tryptamine dimer 39.a
aReagents and conditions: (a) 33 (4.0 equiv), CuI (1.0 equiv), (±)-trans-N,N′-dimethyl-1,2-cyclohexanediamine (0.20 equiv), K3PO4 (11 equiv), 1,4-dioxane, 101 °C, 24 h; (b) TFA/DCM (1:4), 23 °C, 1 h, 21 % (2 steps).
