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For the asymmetric synthesis of aryl-pyridines using a sulfinyl group to induce asymmetry under kinetic control, see ref 23. For other methods, see: (a) Kakiuchi, F.; Le Gendre, P.; Yamada, A.; Ohtaki, H.; Murai, S. Tetrahedron Asymmetry 2000, 11, 2647.
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It is in fact possible to re-isolate and recycle (by further equilibration) the minor, less stable diastereoisomer of 13 in low yield (ca 12%) after this equilibration: yields are limited by the instability of 13 on silica. Higher yields were obtained by Knochel et al. (ref 19) employing Florisil, but our equilibration method is particularly suitable for use on large scale, where the expense of Florisil becomes prohibitive.
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It is in fact possible to re-isolate and recycle (by further equilibration) the minor, less stable diastereoisomer of 13 in low yield (ca 12%) after this equilibration: yields are limited by the instability of 13 on silica. Higher yields were obtained by Knochel et al. (ref 19) employing Florisil, but our equilibration method is particularly suitable for use on large scale, where the expense of Florisil becomes prohibitive.
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