Table 1.

Screening of catalysts.

entry	catalyst (mol %)	additive (mol %)	yield (%)
1a	[IrCp*Cl2]2 (5)	AgSbF6 (20), Cu(OAc)·H2O (20)	0
2	[IrCp*Cl2]2 (2.5)	AgSbF6 (10)	0
3b	[RhCp*Cl2]2 (2.5)	AgSbF6 (10)	30
4b	[RhCp*Cl2]2 (2.5)	AgOTf (10)	20
5b	[RhCp*Cl2]2 (2.5)	AgBF4 (10)	42
6	[RhCp*(MeCN)3](BF4)2 (10)	none	29
7	[RhCp*(OAc)2(H2O)] (10)	HBF4·OEt2 (20)	86

^aThe reaction was examined at 100 °C for 1 h in 1,2-dichloroethane using 4-methoxyphenyl isocyanate. ^bThe reaction time was 24 h.