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Epoxy alcohol 13, 1.4 eq TESOTf, and 1.5 eq of collidine were reacted as in the preparation of 16 to give 95%+yield (<20:1 de) of crude aldehyde 22 which was chromatographed (SiO2, 3% EtOAc/96% Hex/1% TEA) to give 85% of 22. 1H NMR (CDCl3, 500.135 MHz) δ:9.68 (1H, d, J=2.37 Hz), 3.89 (1H, q, J=5.03 Hz), 2.43 (1H, qdd, J=6.95, 5.03, 2.30 Hz), 1.5-1.2 (4H, m), 1.02 (3H, d, J=6.95 Hz), 0.89 (6H, t J=8.0 Hz), 0.85 (3H, t, J=7.14 Hz), and 0.54 (9H, q, J=7.80 Hz). 13C NMR (CDCl3, 90.55 MHz) δ:205.1, 73.3, 51.3, 37.2, 18.1, 14.1, 10.3, 6.4, and 5.1. IR (thin film): 2957 (s), 2938 (s), 2912 (s), 2877 (s), 1726 (s), 1459 (s), 1415 (w), 1379 (w), 1239 (m), 1155 (w), 1074 (s), 1038 (m), 1005 (w), and 741 (s) cm-1. high resolution MS (m/z): 215. 1467, calcd for C11H23O2Si 215.1467 (M-C2H5). [α]D =+14.7° (c=1.89, CH2Cl2). 1H NMR integration of δ 9.69 to δ 9.72 indicated a 90.3:9.7 ratio.

1. customto give 95%+