Table 2.
Nickel-catalyzed N-heterocycle aldehyde coupling scopea
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NiBr2•dme (0.04 mmol, 0.2 eq), bpp (0.04 mmol, 0.2 eq), ≤ 10 μm Zn powder (0.6 mmol, 3.0 eq), H2O (0.6 mmol, 3.0 eq) and DTBP (1.0 mmol, 5 eq).
NiCl2•dme (0.02 mmol, 0.1 eq), bpp (0.02 mmol, 0.1 eq), nano powder Zn (0.4 mmol, 2.0 eq), H2O (0.4 mmol, 2.0 eq) and DTBP (0.8 mmol, 4 eq).
Formed as an 85:15 regioisomeric mixture.
THF (6.0 equiv) was used.