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66149153356
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Recently, we reported a selective ALcyclization with an aryl bromide moiety; see ref 8b
-
Recently, we reported a selective ALcyclization with an aryl bromide moiety; see ref 8b.
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53
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66149094582
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Bosch proposed that the arylsulfonyl group on the indole nitrogen would be transferred to the primary hydroxy group by the action of in situ generated t-BuOTs, and nucleophilic attack of the C-3 position of the resulting NH-indole furnishes the corresponding cyclization product; see ef 9
-
Bosch proposed that the arylsulfonyl group on the indole nitrogen would be transferred to the primary hydroxy group by the action of in situ generated t-BuOTs, and nucleophilic attack of the C-3 position of the resulting NH-indole furnishes the corresponding cyclization product; see ef 9.
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66149097324
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When NaH was used instead of t-BuOK, the desired product 6a was not obtained. This suggests that the C-3 cyclization proceeds through rearrangement ofthe arylsulfonyl group from the nitrogen atom ofthe indole to the hydroxyl group, as proposed by Bosch et al.
-
When NaH was used instead of t-BuOK, the desired product 6a was not obtained. This suggests that the C-3 cyclization proceeds through rearrangement ofthe arylsulfonyl group from the nitrogen atom ofthe indole to the hydroxyl group, as proposed by Bosch et al.
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66149126864
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The high polarity of 6d considerably lowered the chemical yield during purification with column chromatography over silica gel. Use of alumina column partly improved the yield of 6d (45%).
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The high polarity of 6d considerably lowered the chemical yield during purification with column chromatography over silica gel. Use of alumina column partly improved the yield of 6d (45%).
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66149146178
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Other acids were less effective. For example, after indole formation with 1g, 2d, and 3d was completed, the reaction mixture was treated with polyphosphoric acid (PPA) to give 7c in only 19% yield.
-
Other acids were less effective. For example, after indole formation with 1g, 2d, and 3d was completed, the reaction mixture was treated with polyphosphoric acid (PPA) to give 7c in only 19% yield.
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The product 7e was obtained in 95% ee [Chiralcel OD-H, with a linear gradient of i-PrOH (20-40% over 45 min) in hexane in the presence of 0.1% Et2NH]. HPLC charts (7e and an enantiomeric mixture 7e/ent-7e) were given in the Suppoting Information.
-
The product 7e was obtained in 95% ee [Chiralcel OD-H, with a linear gradient of i-PrOH (20-40% over 45 min) in hexane in the presence of 0.1% Et2NH]. HPLC charts (7e and an enantiomeric mixture 7e/ent-7e) were given in the Suppoting Information.
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58
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66149150101
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It should be noted that the indole formation of Mannich adducts derived from 1g did not proceed when using aldehydes other than paraformaldehyde and amino esters
-
It should be noted that the indole formation of Mannich adducts derived from 1g did not proceed when using aldehydes other than paraformaldehyde and amino esters.
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