Table 2.

Influence of additives on selectivity.^[a]

Entry	Solvent	Base/additive	3 a [%][b]	4 a [%][b]	Selectivity 3 a/4 a
1	DMAc	K3PO4	27	31	0.87
2	DMAc	K3PO4/TBACl	9	46	0.19
3	DMAc	K3PO4/TBAF⋅H2O	–	42	–
4	DMAc	K3PO4/TBABr	12	45	0.27
5	DMAc	K3PO4/TBAI	4	13	0.31
6	DMAc	K3PO4/TBA[HSO4]	3	38	0.08
7	DMAc[c]	NaOMe	73	27	2.70
8	DMAc[c]	NaOMe/TBACl	7	93	0.08
9	DMAc[c]	NaOMe/NaCl[d]	28	13	2.15
10	DMAc[c]	NaOMe/KCl[d]	38	12	2.92
11	DMAc[c]	NaOMe/NH4Cl	30	34	0.88

[a] 1 equiv.=0.5 mmol, Atmospheric conditions unless otherwise noted. [b] Isolated yield. [c] Argon atmosphere. [d] 0.125 m solution in DMAc.