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31
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4544358719
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note
-
For 1,2-migration of the thio group proceeding through a thiirenium intermediate, see ref. [5c].
-
-
-
-
32
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4544267404
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note
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4 may participate in either or all steps of the sequence, as silver salts are known to catalyze propargylacyloxy [3,3]-sigmatropic shifts (see ref. [1]) as well as the cycloisomerization of allenyl ketones into furans.[11b,c]
-
-
-
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33
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4544388485
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note
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4 in catalyzing this transformation.
-
-
-
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34
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4544350524
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note
-
Most likely, in keeping with earlier proposals (see ref. [5]), the formation of allene 9 is the rate-determining step; therefore, 9 has never been observed in the reaction mixtures.
-
-
-
-
35
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84985079237
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4-catalyzed cycloisomerization of allenic alcohols into 2,5-dihydrofurans, see: a) L.-I. Olsson, A. Claesson, Synthesis 1979, 743;
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Olsson, L.-I.1
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42
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4544253286
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note
-
See the Supporting Information for details.
-
-
-
-
43
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0141843609
-
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Potentially, furanyl tosylates can be used in cross-coupling reactions. For the Pd-catalyzed cross-coupling of aryl tosylates, see: a) H. N. Nguyen, X. Huang, S. L. Buchwald, J. Am. Chem. Soc. 2003, 125, 11818;
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