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2442520479
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note
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12 of the Mosher esters of diol 11.
-
-
-
-
52
-
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2442551030
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-
note
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In step C, rapid warming to 0°C after addition of aziridine (-)-5 proved to be more consistent and furnished better yields. Slow warming over 1-2 h resulted in capricious behavior (ca. 30-50%), in conjunction with large amounts of (-)-12.
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53
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0001609007
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Jung, M. E.; Gervay, J. J. Am. Chem. Soc. 1991, 113, 224. Without the dithiane moiety, the first cyclization was very slow (40 h), resulting in low yield (55% for mesylation and the first cyclization).
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54
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2442433797
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note
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8h -88° (c 0.50. MeOH)).
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