Table 1.

Addition/cycloisomerization of alkyne 2.^a

Entry	[Ag] catalyst	Loading (mol %)	Yieldb (%)
1	AgOTf	5	88
2	AgOTf	1	89
3	1a	1	92
4	1a	0.5	92
5	1b	1	73
6	1c	1	85
7	1d	1	65

^aUnless specified, all the reactions were carried out in dry CH₂Cl₂ at room temperature for 12–16 h with alkyne 2 (30 mg, 0.15 mmol), MeOH (0.45 mmol) and a silver(I) catalyst (0.5–5 mol %). ^bIsolated yield.