Table 2.

Transannulation of 1-Mesyl-1,2,3-triazoles with Isocyanates^a

entry	product		yield, %b	entry	product		yield, %b	entry	product		yield, %b
1		2b	95	7		2h	83	13		2n	97
2		2c	94	8		2i	53	14		2o	82
3		2d	94	9		2j	89	15		2p	95
4		2e	94	10		2k	92	16		2q	93
5		2f	80	11		2l	69	17		2r	90
6		2g	85	12		2m	85	18		2s	92

^aProcedure: triazole 1 (1.0 mmol), isocyanate (1.2 mmol), Rh₂(S-NTTL)₄ (0.005 mmol) were stirred in 5 mL of dry chloroform at room temperature for 1-6 hours.

^bIsolated yield.