Figure 4.
Mechanistic studies. (A) Temporal control experiments with 2 and 1a. (B) Additive and light-perturbation experiments. (C) Absorption spectra of 2, 1a, and 1d. (D) Mechanistic and NMR experiments performed on Trp analogs. a % conjugate observed by TIC. b Performed in a foiled reaction vessel that was irradiated. c UVP 365 nm lamp (8 W).