Table 2. Three-Component Reaction of Propargylic Alcohol, CO₂, and Vicinal Diol^a.

entry	catalyst	ligand/additive	3a yield (%)b	4a yield (%)b
1			0	0
2	Ag2CO3	PPh3	57	59
3	Ag2O	PPh3	51	49
4	AgOAc	PPh3	47	46
5	Ag2WO4	PPh3	54	48
6	AgNO3	PPh3	0	0
7	AgBF4	PPh3	0	0
8	Ag2CO3		0	0
9	PPh3		0	0
10	Ag2CO3	L1	83	82
11	Ag2CO3	L2	88	92
12	Ag2CO3	L3	75	78
13	Ag2CO3	L4	73	73
14	Ag2CO3	L5	74	76
15	Ag2CO3	L6	93(87)c	91
16	Ag2CO3	L7	82	82
17d	Ag2CO3	L6	92	92
18e	Ag2CO3	L6	59	57

^aReaction conditions: 1a, 152.2 mg, 2 mmol; 2a, 168.2 mg, 2 mmol; CO₂, 2 MPa; catalyst, 0.1 mmol, 5 mol %; ligand/additive, 0.2 mmol, 10 mol %; CH₃CN, 2 mL; 80 °C; 12 h.

^bGC yield.

^cIsolated yield.

^dCO₂, 1.0 MPa.

^eCO₂, 1.0 bar.