Table 3.

Influence of phenyl substituents on yields^a and selectivity (catalysts 7a–f, cf. Scheme 1).

catalyst	R	% yielda,b	% eec
7a	Ph	98	51 (R)
7b	3,5-(CF3)2-Ph	95	42 (R)
7c	3,5-Cl2-Ph	86	34 (R)
7d	3,5-F2	82	38 (R)
7e	4-NO2-Ph	69	43 (R)
7f	4-OMe-Ph	98	37 (R)

^aAll reactions carried out in benzene, 10 mol % cat., rt, 1 h. ^bIsolated yields. ^cChiral HPLC Daicel OJ, hexane/iPrOH 50:50, 1.0 mL/min, 254 nm, (S)-enantiomer: 12.3 min (R)-enantiomer: 26.0 min.