We performed preliminary optimization of the achiral method with the model substrate 3d, beginning with assessment of the metal catalyst. We screened several commercially available metal catalysts with established reactivity in mHAT transformations (Table , entries 1-3). 8e, 8f, 30 Ultimately, we found that other catalysts did not perform better than Fe(acac)3, in line with the original report of the cHAT system (Table , entry 1). 12 We varied metal catalyst loading (Table , entries 4-7), and found that a slightly higher loading of 15 mol% afforded higher conversion to product. Higher concentration (Table , entries 8-9) had minimal impact on conversion, so we moved forward with conditions as in entry 5. Screening results from alternate achiral thiols at varied loadings are detailed in the SI; ultimately the original conditions of 10 mol% thiophenol were confirmed as optimal.