The configurations for the starting epoxides (R)-3 and (S)-3 were incorrectly drawn; the two structures should be exchanged with one another.
The configurations for all intermediates and end products were correct, as further
secured by the following optical rotations: for (R)-4: [α]D
23 –16.9 (c 1.0, CHCl3) {Lit.3a [α]D
25 –16.4 (c 1.035, CHCl3)}; for (R)-5: [α]D
23 –12.4 (c 0.63, CHCl3) {Lit.3a [α]D
25 –12.1 (c 0.62, CHCl3)}.
Synthesis 2011, 2131.
