Table 1 : Enantioselective reaction of 7a.

Entry	RI	LA (eq)	Product (% yield)b	Ee (%)c
1	i-PrI	1.0	8a (87)	80
2	i-PrI	0.5	8a (85)	81
3	i-PrI	0.3	8a (82)	81
4	c-Hexyl I	1.0	8b (82)	81
5	t-BuI	1.0	8c (85)	92

^aReactions were carried out using RI (30 eq) and 1 M Et3B in
hexane (2.5 eq) at -78 °C.
^bIsolated yields.
^cEnantioselectivities were determined by HPLC analysis.