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1H NOE map of key compounds and X-ray data of compound 5j are provided in the Supporting Information.
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1H NOE map of key compounds and X-ray data of compound 5j are provided in the Supporting Information.
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Formation of cyclopentyl phenyl ketone 4 is thought to arise from Au(I)-π-allene intermediate, which initiates a 5-exo-trig cyclization to form vinyl cation E, and ultimately producing desired ketone 4 upon water attack. The uncommon feature of this cyclization is the nature of the Au(I)-π-allene intermediate, which is characterized also by resonance structure D′ such that an intramolecular attack occurs at the terminal allene carbon (Chemical Equation Presented)
-
Formation of cyclopentyl phenyl ketone 4 is thought to arise from Au(I)-π-allene intermediate, which initiates a 5-exo-trig cyclization to form vinyl cation E, and ultimately producing desired ketone 4 upon water attack. The uncommon feature of this cyclization is the nature of the Au(I)-π-allene intermediate, which is characterized also by resonance structure D′ such that an intramolecular attack occurs at the terminal allene carbon (Chemical Equation Presented)
-
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45
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33846675942
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For catalytic cyclization via a π-allene intermediate, see: a
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For catalytic cyclization via a π-allene intermediate, see: (a) Lee, J. H.; Toste, F. D. Angew. Chem., Int. Ed. 2007, 46, 912.
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15 one alternative mechanism involves initial Nazarov cyclization, followed by 6-endo-dig cyclization of π-alkyne H as depicted below; the initial intermediate is Au(I)-π-allene intermediate F′, which activates indene formation to give species G. After protodeauration, a subsequent 6-endo-dig cyclization of alkyne intermediate H provides the desired bicyclo[4.3.0]nonadiene 5a. This pathway, however, is opposed by formation of cyclopentol 6, which indicates initial formation of a cyclopentene ring rather than the indene ring. (Chemical Equation Presented)
-
15 one alternative mechanism involves initial Nazarov cyclization, followed by 6-endo-dig cyclization of π-alkyne H as depicted below; the initial intermediate is Au(I)-π-allene intermediate F′, which activates indene formation to give species G. After protodeauration, a subsequent 6-endo-dig cyclization of alkyne intermediate H provides the desired bicyclo[4.3.0]nonadiene 5a. This pathway, however, is opposed by formation of cyclopentol 6, which indicates initial formation of a cyclopentene ring rather than the indene ring. (Chemical Equation Presented)
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