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. 2024 Nov 25;16(1):124–129. doi: 10.1039/d4sc07495e

Table 1. Optimization studies and control experimentsa.

graphic file with name d4sc07495e-u1.jpg
Entry Deviation [%] Yield of 3ab
1 None 82
2 No base, no light 0
3 Under air instead of N2 0
4 427 nm or 456 nm light 0
5 Na2CO3 instead of Cs2CO3 56
6 TMG instead of Cs2CO3 78
7 1 equiv. Cs2CO3 37
a

Reactions performed over 4 hours in 1 mL of CH3CN using 0.15 mmol of 1a, 0.45 mmol of 2a, and base (2 equiv.) under irradiation by a Kessil lamp (λmax = 390 nm, irradiance = 100 mW cm−2).

b

Yield of 3a determined by 1H NMR analysis of the crude mixture using dibromomethane as the internal standard.