Table 1. Substrate Scope for Enantioselective Synthesis of Substituted Oxatrienes.

entry	R	cat.	product	time (h)	yielda (%)	eeb (%)
1	Ph	A	3a-S	40	98c	98
		B	3a-R	8	74	87
2	o-OMeC6H4	A	3b-S	60	60d	90
		B	3b-R	60	65d	82
3	m-OMeC6H4	A	3c-S	12	98	96
		B	3c-R	12	87	88
4	p-OMeC6H4	A	3d-S	60	25d	94
		B	3d-R	60	20d	76
5	o-MeC6H4	A	3e-S	40	75	88
		B	3e-R	10	68	82
6	p-MeC6H4	A	3f-S	60	43d	94
		B	3f-R	60	57d	72
7	o-FC6H4	A	3g-S	48	78	92
		B	3g-R	48	71	88
8	o-BrC6H4	A	3h-S	30	95	88
		B	3h-R	30	95	78
9	p-BrC6H4	A	3i-S	40	66	94
		B	3i-R	40	32	72
10	o-ClC6H4	A	3j-S	25	99e	90
		B	3j-R	25	89	84
11	p-ClC6H4	A	3k-S	48	58	91
		B	3k-R	48	36	88
12	2-furyl	A	3l-S	48	27	95
		B	3l-R	48	32	78
13	1-naphthyl	A	3m-S	40	76	92
		B	3m-R	40	69	72
14	n-propyl	A	3n-S	72	28 (52)d,f	90
		B	3n-R	72	24 (50)d,f	67
15	isopropyl	A	3o-S	72	29 (87)d,f	94
		B	3o-R	72	23 (80)d,f	58
16	Me	A	3p-S	36	48	90
		B	3p-R	36	26	72

^aIsolated yields.

^bRatios were determined by HPLC analysis using chiral stationary phase columns.

^cReaction was performed on a 1 g scale of 1a.

^dLonger reaction times led to degradation of allenoate 2, and incomplete conversion of dienones was observed.

^eReaction was performed on a 0.5 g scale of 1j.

^fNumbers in parentheses refer to yield based on recovered starting material.