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The Ullmann coupling of 1 (R=H) gives a 2:1 mixture of diastereomers 2 (R=H) in 81% yield that are easily separated by silica gel chromatography. This procedure avoids the generally cumbersome and sometimes difficult resolution step with DBTA. Similar Ullmann couplings and separation of the corresponding diastereomers are employed with other derivatives of 1 (R=OtBu, iPr, Ph, and mesityl) ultimately...
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