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. Author manuscript; available in PMC: 2010 Aug 20.
Published in final edited form as: Org Lett. 2009 Aug 20;11(16):3670–3673. doi: 10.1021/ol901437f

Figure 2.

Figure 2

Diastereomeric ratios of benzannulated spiroketals formed from d-threo-glycal epoxides 3a–i. Isolated yields of 4 (Ti[Oi-Pr]4) and 5 (MeOH or AcOH) shown in parentheses. a Spontaneous spirocyclization (−78 °C → rt). b Remainder methyl glycoside 6. c Inseparable mixture of 4 and 5 (separable after desilylation).