Table 1. Screening of Metal Catalysts and Silyl Reagents.

entry	catalyst	silyl	silyl-OTf (equiv)	react time (min)	conva (%)
1	Cu(OTf)2	Me3Si	1.0	60	75
2	Cu(OTf)2	Me3Si	1.5	50	90
3	CuI	Me3Si	1.0	60	53
4	CuI	Me3Si	1.5	50	67
5	CuOTf	Me3Si	1.0	60	74
6	CuOTf	Me3Si	1.5	50	76
7	Sc(OTf)3	Me3Si	1.5	50	43
8	Rh[COD]2Cl2	Me3Si	1.5	20	68
9	Zn(OTf)2	Me3Si	1.5	20	91
10	Zn(OTf)2	Et3Si	1.5	210	76
11	Zn(OTf)2	iPr3Si	1.5	600	64
12	Zn(OTf)2	tBu2PhSi	1.5	1440	53b

^aDetermined by ¹H NMR.

^bReaction incomplete after 24 h.