Table 2. Highly Diastereoselective Epoxidations of a Wide Range of Alkenyl PIDA Boronates.

^aIsolated yields after silica gel chromatography.

^bThe stereochemistries of epoxides 3a, 3g, and 3n were all determined unambiguously via single-crystal X-ray analysis. The remaining product configurations were assigned by analogy.

^cDiastereomeric ratios determined via 500 MHz ¹H NMR analysis of the unpurified reaction mixtures.

^dConducted on a 15 mmol scale and isolated by crystallization.