Table 1. Catalyst Screening^a.

entry	catalyst	yield (%)b	ee (%)c
1	1	99	56
2	2	99	45
3	3	99	50
4	4	99	71
5	5	99	76
6	6	99	–75
7	7	99	62
8	8	98	48
9	9	98	51
10	10	98	30
11	11	99	44
12	12	99	47

^aMolar ratio: 13a (0.2 mmol), NCS (0.21 mmol), catalyst 1−12 (0.5 mol %), and KF (0.4 mmol).

^bIsolated yields.

^cThe ee values were determined by HPLC analysis using a chiral column Chiralcel OD-H.