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We developed this access because the condensation between the bis(enolate) of tert-butyl acetoacetate and diethyl chlorophosphonate32 provided 29 in unsatisfactory yields and with inseparable contaminants
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We developed this access because the condensation between the bis(enolate) of tert-butyl acetoacetate and diethyl chlorophosphonate32 provided 29 in unsatisfactory yields and with inseparable contaminants.
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This was concluded from the virtual absence of extraresonances in the respective 1H(400MHz, CDCl3) and 13CNMRspectra (100 MHz, CDCl3). We assume that such spectra should have revealed the presence of another diastereomer if the latter represented more than 5% of the material
-
This was concluded from the virtual absence of extraresonances in the respective 1H(400MHz, CDCl3) and 13CNMRspectra (100 MHz, CDCl3). We assume that such spectra should have revealed the presence of another diastereomer if the latter represented more than 5% of the material.
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73
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84055180784
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When the Nazarov reagent 15a was deprotonated by K2CO3 or n-BuLi in the presence of the benzoquinone monoketal 13 or before the latter was added, respectively, the Deslongchamps adduct 34a did not form at all
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When the Nazarov reagent 15a was deprotonated by K2CO3 or n-BuLi in the presence of the benzoquinone monoketal 13 or before the latter was added, respectively, the Deslongchamps adduct 34a did not form at all.
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74
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84857795763
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CCDC849007 (35a) 849008 (38a), and 849006 (38b) contain the crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via the link
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CCDC849007 (35a), 849008 (38a), and 849006 (38b) contain the crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via the link www.ccdc.cam.ac.uk/data-request/cif
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75
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This conclusion is not only based on a plausible analogy but also on circumstantial 1H NMR evidence. In CDCl3 solutions 8a-H is significantly deshielded (35a: δ = 3.40 ppm; 35b: δ = 3.43 ppm; 35c: δ=3.39 ppm; 35d: δ=4.05-4.10 ppm (includes deshielding effect of Rphenyl group); 37: δ=3.22 ppm) compared to 5-H (35a: δ=2.79 ppm; 35b: δ = 2.68 ppm; 35c: δ = 2.58 ppm; 35d: δ = 3.48 ppm (includes deshielding effect of R-phenyl group); 37: δ = 2.56-2.68 ppm). This indicates that 8a-H is cis-oriented and 4-H trans-oriented relative to the ester substituent at C-4a
-
This conclusion is not only based on a plausible analogy but also on circumstantial 1H NMR evidence. In CDCl3 solutions 8a-H is significantly deshielded (35a: δ = 3.40 ppm; 35b: δ = 3.43 ppm; 35c: δ=3.39 ppm; 35d: δ=4.05-4.10 ppm (includes deshielding effect of Rphenyl group); 37: δ=3.22 ppm) compared to 5-H (35a: δ=2.79 ppm; 35b: δ = 2.68 ppm; 35c: δ = 2.58 ppm; 35d: δ = 3.48 ppm (includes deshielding effect of R-phenyl group); 37: δ = 2.56-2.68 ppm). This indicates that 8a-H is cis-oriented and 4-H trans-oriented relative to the ester substituent at C-4a.
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