Table 2.

Asymmetric Allylboration of Acyl Imines^a

entry	solvent	additive	% yieldb	erc
1	THF	-	32	58:42
2	Et2O	-	28	60:20
3	CH2Cl2	-	75	92:8
4	C6H5CH3: C6H5CF3 3:1	-	77	92:8
5	C6H5CH3	-	81	93:7
6	C6H5CH3	3Å MS	87	99:1
7	C6H5CH3	4Å MS	85	97:3
8	C6H5CH3	5Å MS	83	90:10

^aReactions were run with 0.125 mmol borane, 0.125 mmol acyl imine, 15 mol % catalyst and in toluene (0.1 M) for 16 h under Ar, followed by flash chromatography on silica gel.

^bIsolated yield.

^cEnantiomeric ratios determined by chiral HPLC analysis.