Table 2.

Base screening of the N-formylation of amine ¹.

Entry	Base	Yield 2	Entry	Base	Yield 2
1	-	14	6	K2CO3	54
2	LiOH·H2O	60	7	Cs2CO3	69
3	NaOH	65	8	KOt Bu	69
4	KOH	75	9	K3PO4	60
5	CsOH·H2O	91	10	CsF	39

¹ Reaction conditions: 1a (0.20 mmol), AuPd–Fe₃O₄ (1.4 mol%), base (3.0 equiv), O₂ (1.0 atm), methanol (1.0 mL), r. t., 18 h. ² Determined from ¹H NMR spectral analysis through the use of mesitylene as an internal standard.