Table 1.

Sequential Brook/Ireland-Claisen Rearrangements of Silyl Glyoxylates

entry	silyl glyoxylate	Nu	yield, dr
1	1a	MeMgBr/TMSOTf	7
2	1b	MeMgBr/TMSOTf	8
3	1c	MeMgBr/TMSOTf	9
4	1a		10
5	1a	ZnEt2	11
6	1a		12
7	1b		13
8	1c		14
9	1a		15
10	1b		16
11	1a		17
12	1b		18