Table 2. Effect of the free hydroxyl group on the catalyst.

Entry	PTC (10 mol%)	Base	Solvent	Time	Yield (%)	% ee
1	11	1 M KOH	CHCl3	10 min	77	48 (S)
2	11	1 M KOH	CH2Cl2	10 min	76	52 (S)
3	11	1 M NaOH	CH2Cl2	10 min	88	54 (S)
4	12	1 M NaOH	CH2Cl2	24 h	74	0
5	13	1 M KOH	CHCl3	24 h	66	0
6	13	1 M KOH	Toluene	10 min	45	0