Table 1.

Wittig reaction of boronate ylide (11) with various aldehydes^a

Entry	Aldehyde	Product	Yieldb (%)
1		1b E:Z= 74:26	86
2		1c E:Z= 64:36	72
3		1dE:Z= 75:25	71
4		1e E:Z= 55:45	76
5		1f E:Z= 100:0	78

^aAll reactions were performed using 1 equiv of aldehyde and 3 equiv of ^tBuONa in DMF for 2–12 h.

^bIsolated yield (mixture of E and Z) refers to aldehyde and the E/Z ratios were determined by ¹H NMR.