Scheme 1.

Scope of epoxidesa

^a As in Table 2, footnote a, but with 1 equiv of epoxide. Yield is the isolated yield of the product shown. ^b Mixture of 2ab (66%) and 3ab (10%). ^c Product of internal attack. 2ae was also isolated in 14% yield. ^d Longer reaction time (24 h) was required. ^e From 0.56 mmol of isobutene oxide.