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See ref 21b for an example in which the Dess-Martin periodinane was used for a similar oxidation.
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3As in THF, but these conditions did not give any of the desired product for the coupling of 2 and 3 even under prolonged reaction times. For an example of a similar Stille coupling using a vinyl bromide, see: Romo, D.; Rzasa, R. M.; Shea, H. A.; Park, K.; Langenhan, J. M.; Sun, L.; Akhiezer, A.; Liu, J. O. J. Am. Chem. Soc. 1998, 120, 12237-12254.
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